The Latin adjective ūnus -a -um means "one" and serves as both a numeral and an indefinite article in Latin. Unlike English, which has distinct words for the number "one" and the indefinite article "a/an," Latin uses ūnus for both functions. This word follows the irregular genitive singular ending pattern (-īus) and dative singular ending (-ī) found in a small group of common adjectives.
FAQ Schema: Q: What does ūnus -a -um mean in Latin? A: Ūnus -a -um means "one" in Latin. It functions as both the number one and can serve as an indefinite article (a/an) in certain contexts.
In this lesson, ūnus will appear in various cases, genders, and contexts to demonstrate its flexibility in conversational Latin. You'll see it used as a counting number, as an indefinite article, and in idiomatic expressions. The examples progress from simple numerical uses to more complex conversational patterns.
Educational Schema: Subject: Latin Language Learning Level: Beginner to Intermediate Topic: Cardinal Numbers and Indefinite Articles Focus: Conversational Latin Usage Lesson Type: Grammar and Vocabulary
-
Ūnus -a -um follows an irregular declension pattern with genitive -īus and dative -ī -
It serves dual functions as the number "one" and as an indefinite article -
The word agrees in gender, number, and case with the noun it modifies -
Common in conversational expressions and idiomatic phrases -
Essential for basic counting and everyday Latin communication
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
53.1 Ūnus one discipulus student adest is-present hodiē today
53.2 Quot how-many librōs books habēs do-you-have? Ūnum one tantum only
53.3 Ūna one puella girl in in hortō garden lūdit plays
53.4 Dā give mihi to-me ūnam one rosam rose rubram red
53.5 Ex from omnibus all amīcīs friends ūnus one vēnit came
53.6 Ūnō with-one digitō finger monstrō I-point
53.7 Habēsne do-you-have ūnum one frātrem brother? Nōn no, duōs two
53.8 Ūnīus of-one diēī day iter journey est it-is
53.9 In in ūnā one domō house habitāmus we-live
53.10 Ūnī to-one deō god servīre to-serve dēbēmus we-ought
53.11 Nōn not ūna one via way sed but multae many sunt there-are
53.12 Ūnum one rogō I-ask: cūr why tacēs are-you-silent?
53.13 Omnēs all ūnō with-one ōre mouth clāmant they-shout
53.14 Ūna one hōrā hour ante before vēnī I-came
53.15 Ad to ūnum one omnēs all periērunt they-perished
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
53.1 Ūnus discipulus adest hodiē. One student is present today.
53.2 Quot librōs habēs? Ūnum tantum. How many books do you have? Only one.
53.3 Ūna puella in hortō lūdit. One girl plays in the garden.
53.4 Dā mihi ūnam rosam rubram. Give me one red rose.
53.5 Ex omnibus amīcīs ūnus vēnit. Of all my friends, one came.
53.6 Ūnō digitō monstrō. I point with one finger.
53.7 Habēsne ūnum frātrem? Nōn, duōs. Do you have one brother? No, two.
53.8 Ūnīus diēī iter est. It's a journey of one day.
53.9 In ūnā domō habitāmus. We live in one house.
53.10 Ūnī deō servīre dēbēmus. We ought to serve one god.
53.11 Nōn ūna via sed multae sunt. There is not one way but many.
53.12 Ūnum rogō: cūr tacēs? I ask one thing: why are you silent?
53.13 Omnēs ūnō ōre clāmant. All shout with one voice.
53.14 Ūna hōrā ante vēnī. I came one hour ago.
53.15 Ad ūnum omnēs periērunt. All perished to the last one.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
53.1 Ūnus discipulus adest hodiē.
53.2 Quot librōs habēs? Ūnum tantum.
53.3 Ūna puella in hortō lūdit.
53.4 Dā mihi ūnam rosam rubram.
53.5 Ex omnibus amīcīs ūnus vēnit.
53.6 Ūnō digitō monstrō.
53.7 Habēsne ūnum frātrem? Nōn, duōs.
53.8 Ūnīus diēī iter est.
53.9 In ūnā domō habitāmus.
53.10 Ūnī deō servīre dēbēmus.
53.11 Nōn ūna via sed multae sunt.
53.12 Ūnum rogō: cūr tacēs?
53.13 Omnēs ūnō ōre clāmant.
53.14 Ūna hōrā ante vēnī.
53.15 Ad ūnum omnēs periērunt.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
The adjective ūnus -a -um belongs to a special group of adjectives that follow the 1st and 2nd declension patterns but with irregular genitive and dative singular forms. This group includes: ūnus (one), sōlus (alone), tōtus (whole), ullus (any), nūllus (none), alter (the other), uter (which of two), neuter (neither), and alius (another).
Declension Pattern:
Masculine: -
Nominative: ūnus -
Genitive: ūnīus (not ūnī) -
Dative: ūnī (not ūnō) -
Accusative: ūnum -
Ablative: ūnō
Feminine: -
Nominative: ūna -
Genitive: ūnīus (not ūnae) -
Dative: ūnī (not ūnae) -
Accusative: ūnam -
Ablative: ūnā
Neuter: -
Nominative: ūnum -
Genitive: ūnīus (not ūnī) -
Dative: ūnī (not ūnō) -
Accusative: ūnum -
Ablative: ūnō
-
Using regular 1st/2nd declension endings: Students often write ūnae instead of ūnīus for feminine genitive -
Forgetting the long ū: Writing unus instead of ūnus changes the meaning -
Confusing with English: Trying to use ūnus exactly like English "a/an" in all contexts -
Gender agreement: Forgetting to match the gender of ūnus with its noun
Unlike English, which distinguishes between "one" (number) and "a/an" (article), Latin uses ūnus for both functions. Context determines which English translation is appropriate. Latin also requires gender agreement, which English articles lack.
-
Identify the noun that ūnus modifies -
Determine the noun's gender (masculine, feminine, or neuter) -
Determine the required case based on the noun's function in the sentence -
Apply the correct form of ūnus matching both gender and case -
Remember the special -īus genitive and -ī dative for all genders
-
Classification: Numeral adjective and indefinite article -
Declension: 1st and 2nd with irregular genitive/dative singular -
Special forms: Gen. sing. -īus, Dat. sing. -ī (all genders) -
Idiomatic uses: ad ūnum (to the last one), ūnō ōre (with one voice) -
Related forms: ūnicus (unique), ūnitās (unity), ūnīre (to unite)
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
In Roman culture, the concept of ūnus held significant philosophical and religious importance beyond its basic numerical meaning. The Stoics particularly emphasized the unity of the cosmos (ūnum universum), while monotheistic tendencies in later Roman philosophy spoke of ūnus deus (one god), preparing the cultural ground for Christianity's spread.
The Romans had various expressions using ūnus that reveal cultural values. The phrase ūnō ōre (with one mouth/voice) emphasized consensus and harmony, highly valued in Roman political life. The expression ad ūnum (to one/to the last) reflected Roman thoroughness and completeness in military contexts.
Unlike modern European languages that developed articles from Latin ūnus (Spanish "un/una," French "un/une," Italian "un/una"), Classical Latin used ūnus more sparingly as an article, primarily for emphasis or to mean "a certain." This shows how Latin's concise style differed from modern conversational patterns.
In Roman education, learning to count began with ūnus, and children's counting rhymes often played with the word. The Romans also used ūnus in dice games (ālea), where throwing a single pip was called canis (dog) and considered unlucky, showing how numbers carried cultural associations beyond their mathematical value.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
Source: Erasmus, Colloquia Familiaria, "De Rebus ac Vocabulis" (1518)
Original Text: Magister: Quot sunt partes ōrātiōnis? Discipulus: Octō, ut aiunt grammaticī. Magister: At ego ūnam tantum novī. Discipulus: Quōmodo ūnam? Magister: Quia ūna vēritās est, ūnum verbum Deī, ūna sapientia. Nam multa verba mendācium saepe tegunt. In ūnō verbō omnis doctrīna continētur. Quid plūra? Ūnum est necessārium, ut ait Dominus noster. Discipulus: Mīror tē philosophārī cum dē grammaticā rogem!
Part F-A (Interleaved Text)
Magister teacher: Quot how-many sunt are partēs parts ōrātiōnis of-speech? Discipulus student: Octō eight, ut as aiunt say grammaticī grammarians. Magister teacher: At but ego I ūnam one tantum only novī know. Discipulus student: Quōmodo how ūnam one? Magister teacher: Quia because ūna one vēritās truth est is, ūnum one verbum word Deī of-God, ūna one sapientia wisdom. Nam for multa many verba words mendācium lie saepe often tegunt cover. In in ūnō one verbō word omnis all doctrīna teaching continētur is-contained. Quid what plūra more? Ūnum one-thing est is necessārium necessary, ut as ait says Dominus Lord noster our. Discipulus student: Mīror I-wonder tē you philosophārī to-philosophize cum when dē about grammaticā grammar rogem I-ask!
Magister: Quot sunt partes ōrātiōnis? Teacher: How many parts of speech are there?
Discipulus: Octō, ut aiunt grammaticī. Student: Eight, as the grammarians say.
Magister: At ego ūnam tantum novī. Teacher: But I know only one.
Discipulus: Quōmodo ūnam? Student: How so, one?
Magister: Quia ūna vēritās est, ūnum verbum Deī, ūna sapientia. Nam multa verba mendācium saepe tegunt. In ūnō verbō omnis doctrīna continētur. Quid plūra? Ūnum est necessārium, ut ait Dominus noster. Teacher: Because there is one truth, one word of God, one wisdom. For many words often conceal a lie. In one word all teaching is contained. What more need be said? One thing is necessary, as our Lord says.
Discipulus: Mīror tē philosophārī cum dē grammaticā rogem! Student: I'm amazed that you philosophize when I ask about grammar!
Magister: Quot sunt partes ōrātiōnis? Discipulus: Octō, ut aiunt grammaticī. Magister: At ego ūnam tantum novī. Discipulus: Quōmodo ūnam? Magister: Quia ūna vēritās est, ūnum verbum Deī, ūna sapientia. Nam multa verba mendācium saepe tegunt. In ūnō verbō omnis doctrīna continētur. Quid plūra? Ūnum est necessārium, ut ait Dominus noster. Discipulus: Mīror tē philosophārī cum dē grammaticā rogem!
This dialogue brilliantly showcases the multiple uses of ūnus in philosophical discourse. The teacher plays on the student's expectation of a grammatical answer by using ūnus repeatedly to make a theological point.
Note the different forms: -
ūnam (accusative feminine): modifying partem understood -
ūna (nominative feminine): modifying vēritās and sapientia -
ūnum (nominative/accusative neuter): modifying verbum and standing alone as "one thing" -
ūnō (ablative neuter): in the phrase in ūnō verbō
The passage demonstrates the philosophical weight that ūnus carried in Christian humanist Latin, where unity becomes a theological principle. The teacher's response shows typical Renaissance wordplay, moving from grammatical to spiritual instruction.
The construction ūnum est necessārium (one thing is necessary) echoes Luke 10:42 from the Vulgate, showing how Biblical Latin influenced conversational academic Latin in Erasmus's time.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
-
Salvē hello, tabernāria shopkeeper! Quid what hodiē today vēndis do-you-sell? -
Multa many-things vendō I-sell, domine sir. Ecce behold pōma apples optima excellent! -
Quot how-many cōnstant do-they-cost? Volō I-want ūnum one tantum only. -
Ūnum one pōmum apple? Sed but nēmō no-one ūnum one sōlum alone emit buys! -
Cūr why nōn not? Ūnus one sum I-am et and ūnum one edere to-eat possum I-can. -
Veniam pardon dō I-give. Ūnīus of-one assīs penny pretium price est it-is. -
Nimis too-much est it-is! Prō for ūnō one pōmō apple integer whole assis penny? -
At but sunt they-are ex from ūnō one agrō field optimō best nostrō our. -
Ūnam one rem thing sciō I-know: cāriōra more-expensive sunt they-are pōma apples tua your quam than aurum gold! -
Nōlī don't iocārī joke! Ūnā in-one hebdomadā week omnia all vēndidī I-sold praeter except haec these. -
Bene well. Ūnum one emam I-will-buy sī if ūnum one grātīs free addideris you-will-add. -
Quid what? Duō two prō for pretiō price ūnīus of-one? Fierī to-happen nōn not potest it-can! -
Tunc then ad to ūnum one alium another tabernārium shopkeeper ībō I-will-go. -
Manē wait! Accipe take duo two. Melior better est is ūnus one emptor buyer quam than nūllus none. -
Grātiās thanks! Videō I-see tē you ūnō with-one corde heart generōsō generous praeditum endowed esse to-be.
-
Salvē, tabernāria! Quid hodiē vēndis? Hello, shopkeeper! What are you selling today? -
Multa vendō, domine. Ecce pōma optima! I'm selling many things, sir. Look at these excellent apples! -
Quot cōnstant? Volō ūnum tantum. How much do they cost? I only want one. -
Ūnum pōmum? Sed nēmō ūnum sōlum emit! One apple? But nobody buys just one! -
Cūr nōn? Ūnus sum et ūnum edere possum. Why not? I'm alone and can eat one. -
Veniam dō. Ūnīus assīs pretium est. I beg your pardon. The price is one penny. -
Nimis est! Prō ūnō pōmō integer assis? That's too much! A whole penny for one apple? -
At sunt ex ūnō agrō optimō nostrō. But they're from our one best field. -
Ūnam rem sciō: cāriōra sunt pōma tua quam aurum! I know one thing: your apples are more expensive than gold! -
Nōlī iocārī! Ūnā hebdomadā omnia vēndidī praeter haec. Don't joke! In one week I sold everything except these. -
Bene. Ūnum emam sī ūnum grātīs addideris. Fine. I'll buy one if you add one free. -
Quid? Duō prō pretiō ūnīus? Fierī nōn potest! What? Two for the price of one? That's impossible! -
Tunc ad ūnum alium tabernārium ībō. Then I'll go to another shopkeeper. -
Manē! Accipe duo. Melior est ūnus emptor quam nūllus. Wait! Take two. One buyer is better than none. -
Grātiās! Videō tē ūnō corde generōsō praeditum esse. Thanks! I see you're endowed with one generous heart.
-
Salvē, tabernāria! Quid hodiē vēndis? -
Multa vendō, domine. Ecce pōma optima! -
Quot cōnstant? Volō ūnum tantum. -
Ūnum pōmum? Sed nēmō ūnum sōlum emit! -
Cūr nōn? Ūnus sum et ūnum edere possum. -
Veniam dō. Ūnīus assīs pretium est. -
Nimis est! Prō ūnō pōmō integer assis? -
At sunt ex ūnō agrō optimō nostrō. -
Ūnam rem sciō: cāriōra sunt pōma tua quam aurum! -
Nōlī iocārī! Ūnā hebdomadā omnia vēndidī praeter haec. -
Bene. Ūnum emam sī ūnum grātīs addideris. -
Quid? Duō prō pretiō ūnīus? Fierī nōn potest! -
Tunc ad ūnum alium tabernārium ībō. -
Manē! Accipe duo. Melior est ūnus emptor quam nūllus. -
Grātiās! Videō tē ūnō corde generōsō praeditum esse.
This market dialogue demonstrates the practical use of ūnus in commercial negotiations. The conversation plays with the various forms and meanings of ūnus throughout the haggling process.
Key grammatical points illustrated: -
ūnum (accusative neuter) as direct object: volō ūnum (I want one) -
ūnīus (genitive) expressing price: ūnīus assīs (of one penny) -
ūnō (ablative) in various constructions: prō ūnō pōmō (for one apple), ūnō corde (with one heart) -
ūnā (ablative feminine) expressing time: ūnā hebdomadā (in one week)
The dialogue shows typical Roman market banter, where haggling was expected. The phrase duō prō pretiō ūnīus (two for the price of one) shows that commercial promotions existed even in ancient times.
The construction melior est ūnus emptor quam nūllus (one buyer is better than none) uses the comparative with quam and demonstrates practical merchant wisdom. The final compliment using ūnō corde generōsō praeditum shows the ablative of description, a common Latin construction for expressing characteristics.
Note the progression from conflict to resolution, typical of Roman comedy dialogues that influenced later colloquial literature like Erasmus's dialogues.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
The Latinum Institute has been pioneering online Latin language education since 2006, developing innovative methods for autodidactic learners worldwide. These conversational Latin lessons represent a unique approach that bridges the gap between traditional grammatical instruction and practical communication skills.
Each lesson in this series follows a carefully structured format designed to maximize comprehension and retention: -
Interlinear glossing (Part A) allows beginners to understand every word immediately Salvē hello, tabernāria shopkeeper! Quid what hodiē today vēndis do-you-sell?
Multa many-things vendō I-sell, domine sir. Ecce behold pōma apples optima excellent!
Quot how-many cōnstant do-they-cost? Volō I-want ūnum one tantum only.
Ūnum one pōmum apple? Sed but nēmō no-one ūnum one sōlum alone emit buys!
Cūr why nōn not? Ūnus one sum I-am et and ūnum one edere to-eat possum I-can.
Veniam pardon dō I-give. Ūnīus of-one assīs penny pretium price est it-is.
Nimis too-much est it-is! Prō for ūnō one pōmō apple integer whole assis penny?
At but sunt they-are ex from ūnō one agrō field optimō best nostrō our.
Ūnam one rem thing sciō I-know: cāriōra more-expensive sunt they-are pōma apples tua your quam than aurum gold!
Nōlī don't iocārī joke! Ūnā in-one hebdomadā week omnia all vēndidī I-sold praeter except haec these.
Bene well. Ūnum one emam I-will-buy sī if ūnum one grātīs free addideris you-will-add.
Quid what? Duō two prō for pretiō price ūnīus of-one? Fierī to-happen nōn not potest it-can!
Tunc then ad to ūnum one alium another tabernārium shopkeeper ībō I-will-go.
Manē wait! Accipe take duo two. Melior better est is ūnus one emptor buyer quam than nūllus none.
Grātiās thanks! Videō I-see tē you ūnō with-one corde heart generōsō generous praeditum endowed esse to-be.