← Latinum Institute Ecclesiastical Latin Reading Course
The Latin verb claudere (to close, shut) occupies a position of profound theological significance in the Catholic tradition. From the mysterious porta clausa of Ezekiel’s vision—interpreted by the Church Fathers as a type of Mary’s perpetual virginity—to the clavis David (Key of David) in the Apocalypse that opens and none can shut, the concept of divine closing and opening pervades Sacred Scripture and the liturgy.
In this lesson, we encounter claudere in its various forms: the present claudit (he closes), the perfect clausit (he closed), the passive participle clausus/clausa/clausum (closed), and the sublime ablative absolute clauso ostio (with the door having been closed) that Christ Himself employs when teaching the disciples to pray in secret.
The Ecclesiastical pronunciation follows the Italian tradition: c before e or i sounds like English “ch,” while au forms a diphthong as in “ow” of “how.” Thus: claudere = /klau̯ˈde.re/.
FAQ: What does “claudere” mean in Latin? The verb claudere (principal parts: claudō, claudere, clausī, clausum) means “to close, shut, lock” in its primary sense. Extended meanings include: to conclude or finish (an oration), to enclose or confine, and to blockade or besiege. In Catholic theological texts, it carries deep symbolic weight relating to divine authority over access to salvation.
Link to Course Index: https://latinum.substack.com/p/index
Key Takeaways -
Claudere is a 3rd conjugation verb with perfect stem claus- -
The perfect passive participle clausus, -a, -um appears frequently in Scripture -
The ablative absolute clauso ostio (with the door closed) demonstrates a key Latin construction -
Theological uses include the porta clausa (Marian typology) and clavis David (Christ’s authority) -
Compound verbs: includere (shut in), excludere (shut out), concludere (conclude)
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166.1a Porta gate-NOM clausa closed-NOM.F est is
166.1b Porta (ˈpor.ta) gate-NOM clausa (ˈklau̯.za) closed-NOM.F est (est) is
166.2a Monachus monk-NOM ostium door-ACC claudit closes
166.2b Monachus (moˈna.kus) monk-NOM ostium (ˈos.ti.um) door-ACC claudit (ˈklau̯.dit) closes
166.3a Nemo no.one-NOM jānuam door-ACC aperit opens
166.3b Nemo (ˈne.mo) no.one-NOM jānuam (ˈja.nu.am) door-ACC aperit (ˈa.pe.rit) opens
166.4a Dominus Lord-NOM arcam ark-ACC clausit closed
166.4b Dominus (ˈdo.mi.nus) Lord-NOM arcam (ˈar.kam) ark-ACC clausit (ˈklau̯.zit) closed
166.5a Virgō virgin-NOM porta gate-NOM clausa closed-NOM.F est is
166.5b Virgō (ˈvir.go) virgin-NOM porta (ˈpor.ta) gate-NOM clausa (ˈklau̯.za) closed-NOM.F est (est) is
166.6a Sacerdōs priest-NOM portam gate-ACC ecclesiæ of.church-GEN clausit closed
166.6b Sacerdōs (sa.ˈtʃer.dos) priest-NOM portam (ˈpor.tam) gate-ACC ecclesiæ (ek.ˈkle.zi.e) of.church-GEN clausit (ˈklau̯.zit) closed
166.7a Qui who-NOM aperit opens et and nemo no.one-NOM claudit closes
166.7b Qui (kwi) who-NOM aperit (ˈa.pe.rit) opens et (et) and nemo (ˈne.mo) no.one-NOM claudit (ˈklau̯.dit) closes
166.8a Clausō closed-ABL ostiō door-ABL ōrā pray-IMPV Patrem Father-ACC tuum your-ACC
166.8b Clausō (ˈklau̯.zo) closed-ABL ostiō (ˈos.ti.o) door-ABL ōrā (ˈo.ra) pray-IMPV Patrem (ˈpa.trem) Father-ACC tuum (ˈtu.um) your-ACC
166.9a Frātrēs brothers-NOM portās gates-ACC monastēriī of.monastery-GEN claudunt close
166.9b Frātrēs (ˈfra.tres) brothers-NOM portās (ˈpor.tas) gates-ACC monastēriī (mo.nas.ˈte.ri.i) of.monastery-GEN claudunt (ˈklau̯.dunt) close
166.10a Christus Christ-NOM clavem key-ACC David of.David habet has
166.10b Christus (ˈkris.tus) Christ-NOM clavem (ˈkla.vem) key-ACC David (ˈda.vid) of.David habet (ˈha.bet) has
166.11a Et and clausa closed-NOM.F est is jānua door-NOM
166.11b Et (et) and clausa (ˈklau̯.za) closed-NOM.F est (est) is jānua (ˈja.nu.a) door-NOM
166.12a Porta gate-NOM hæc this-NOM.F clausa closed-NOM.F erit will.be
166.12b Porta (ˈpor.ta) gate-NOM hæc (hek) this-NOM.F clausa (ˈklau̯.za) closed-NOM.F erit (ˈe.rit) will.be
166.13a Dominus Lord-NOM Deus God-NOM Isrāēl of.Israel ingressus having.entered-NOM.M est is per through eam it-ACC.F
166.13b Dominus (ˈdo.mi.nus) Lord-NOM Deus (ˈde.us) God-NOM Isrāēl (is.ra.ˈel) of.Israel ingressus (in.ˈgres.sus) having.entered-NOM.M est (est) is per (per) through eam (ˈe.am) it-ACC.F
166.14a Claudit closes et and nemo no.one-NOM aperit opens
166.14b Claudit (ˈklau̯.dit) closes et (et) and nemo (ˈne.mo) no.one-NOM aperit (ˈa.pe.rit) opens
166.15a Veni come-IMPV et and ēduc lead.out-IMPV vinctum prisoner-ACC dē from domō house-ABL carceris of.prison-GEN
166.15b Veni (ˈve.ni) come-IMPV et (et) and ēduc (ˈe.duk) lead.out-IMPV vinctum (ˈviŋk.tum) prisoner-ACC dē (de) from domō (ˈdo.mo) house-ABL carceris (ˈkar.tʃe.ris) of.prison-GEN
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166.1 Porta clausa est. “The gate is closed.”
166.2 Monachus ostium claudit. “The monk closes the door.”
166.3 Nemo jānuam aperit. “No one opens the door.”
166.4 Dominus arcam clausit. “The Lord closed the ark.”
166.5 Virgō porta clausa est. “The Virgin is a closed gate.”
166.6 Sacerdōs portam ecclesiæ clausit. “The priest closed the gate of the church.”
166.7 Qui aperit et nemo claudit. “He who opens and no one closes.”
166.8 Clausō ostiō, ōrā Patrem tuum. “With the door closed, pray to your Father.”
166.9 Frātrēs portās monastēriī claudunt. “The brothers close the gates of the monastery.”
166.10 Christus clavem David habet. “Christ has the key of David.”
166.11 Et clausa est jānua. “And the door was closed.”
166.12 Porta hæc clausa erit. “This gate shall remain closed.”
166.13 Dominus Deus Isrāēl ingressus est per eam. “The Lord God of Israel has entered through it.”
166.14 Claudit, et nemo aperit. “He closes, and no one opens.”
166.15 Veni, et ēduc vinctum dē domō carceris. “Come, and lead forth the prisoner from the prison house.”
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166.1 Porta clausa est.
166.2 Monachus ostium claudit.
166.3 Nemo jānuam aperit.
166.4 Dominus arcam clausit.
166.5 Virgō porta clausa est.
166.6 Sacerdōs portam ecclesiæ clausit.
166.7 Qui aperit et nemo claudit.
166.8 Clausō ostiō, ōrā Patrem tuum.
166.9 Frātrēs portās monastēriī claudunt.
166.10 Christus clavem David habet.
166.11 Et clausa est jānua.
166.12 Porta hæc clausa erit.
166.13 Dominus Deus Isrāēl ingressus est per eam.
166.14 Claudit, et nemo aperit.
166.15 Veni, et ēduc vinctum dē domō carceris.
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These are the grammar rules for claudere:
Principal Parts: claudō, claudere, clausī, clausum (3rd conjugation)
Present Active Indicative: claudō (I close), claudis (you close), claudit (he/she closes), claudimus (we close), clauditis (you all close), claudunt (they close)
Perfect Active Indicative: clausī (I closed), clausistī (you closed), clausit (he/she closed), clausimus (we closed), clausistis (you all closed), clausērunt (they closed)
Perfect Passive Participle: clausus, clausa, clausum — closed (declines as 1st/2nd declension adjective) Examples: porta clausa (a closed gate, fem.), ostium clausum (a closed door, neut.)
The Ablative Absolute Construction: The phrase clausō ostiō in Matthew 6:6 demonstrates the ablative absolute—an independent participial phrase in the ablative case. Structure: noun (ABL) + participle (ABL) = “with [noun] having been [participle]” Thus: clausō (ABL) ostiō (ABL) = “with the door having been closed” or simply “with the door closed”
Compound Verbs Derived from Claudere: -
inclūdere (in + claudere) = to shut in, enclose -
exclūdere (ex + claudere) = to shut out, exclude -
conclūdere (con + claudere) = to conclude, confine -
reclūdere (re + claudere) = to open, unlock (note reversal of meaning)
Common Mistakes: -
Confusing claudo (I close) with claudeo (I limp)—both exist in Latin -
Forgetting gender agreement: porta clausa (f.), ostium clausum (n.) -
Misplacing the ablative absolute—it should be syntactically independent
Passive Voice Formation: Present passive: claudor, clauderis, clauditur, claudimur, claudiminī, clauduntur Perfect passive: clausus sum (I was closed / I have been closed)
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Theological Significance of Claudere
In Catholic theology, the verb claudere and its participle clausus/clausa carry profound symbolic weight far exceeding their literal meaning.
The Porta Clausa (Ezekiel 44:1-2): The prophet Ezekiel describes a vision of the Temple in which he sees the eastern gate clausa (closed), and God declares it shall remain forever shut because “the Lord God of Israel has entered through it.” From the earliest centuries, the Church Fathers interpreted this passage as a type of Mary’s perpetual virginity—she is the porta clausa through whom God alone entered, and which remained closed before, during, and after the birth of Christ. St. Ambrose, St. Jerome, St. Anselm, and St. Bernard of Clairvaux all expound this typology.
The Clavis David (Revelation 3:7): Christ describes Himself as the one “who has the key of David, who opens and no one closes, who closes and no one opens.” This passage, echoing Isaiah 22:22, establishes Christ’s absolute authority over access to salvation. The medieval O Clavis David antiphon, sung during Advent, draws directly from this text.
The Parable of the Ten Virgins (Matthew 25:10): When the foolish virgins return from buying oil, they find the door clausa—closed against them. The eschatological closing of the door represents the finality of judgment and the urgency of spiritual preparation.
Monastic Horarium: In Benedictine monasteries, the closing of gates at Compline (night prayer) carries symbolic significance—the monks “close” themselves within the enclosure to pray, following Christ’s command to pray “with the door closed” (clauso ostio).
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From the O Clavis David Antiphon (8th century Advent Liturgy)
F-A: Interleaved Text
O O Clavis key-NOM David of.David et and sceptrum scepter-NOM domus of.house-GEN Isrāēl of.Israel
O (o) O Clavis (ˈkla.vis) key-NOM David (ˈda.vid) of.David et (et) and sceptrum (ˈskep.trum) scepter-NOM domus (ˈdo.mus) of.house-GEN Isrāēl (is.ra.ˈel) of.Israel
qui who-NOM aperis open-2SG et and nemo no.one-NOM claudit closes
qui (kwi) who-NOM aperis (ˈa.pe.ris) open-2SG et (et) and nemo (ˈne.mo) no.one-NOM claudit (ˈklau̯.dit) closes
claudis close-2SG et and nemo no.one-NOM aperit opens
claudis (ˈklau̯.dis) close-2SG et (et) and nemo (ˈne.mo) no.one-NOM aperit (ˈa.pe.rit) opens
veni come-IMPV et and ēduc lead.out-IMPV vinctum prisoner-ACC dē from domō house-ABL carceris of.prison-GEN
veni (ˈve.ni) come-IMPV et (et) and ēduc (ˈe.duk) lead.out-IMPV vinctum (ˈviŋk.tum) prisoner-ACC dē (de) from domō (ˈdo.mo) house-ABL carceris (ˈkar.tʃe.ris) of.prison-GEN
sedentem sitting-ACC in in tenebrīs darkness-ABL et and umbrā shadow-ABL mortis of.death-GEN
sedentem (seˈden.tem) sitting-ACC in (in) in tenebrīs (teˈne.bris) darkness-ABL et (et) and umbrā (ˈum.bra) shadow-ABL mortis (ˈmor.tis) of.death-GEN
F-B: Authentic Text with Translation
O Clavis David, et sceptrum domus Isrāēl; qui aperis, et nemo claudit; claudis, et nemo aperit: veni, et ēduc vinctum dē domō carceris, sedentem in tenebrīs, et umbrā mortis.
“O Key of David, and scepter of the House of Israel; you who open and no one closes; you close and no one opens: come, and lead forth the prisoner from the prison house, sitting in darkness and the shadow of death.”
F-C: Authentic Text Only
O Clavis David, et sceptrum domus Isrāēl; qui aperis, et nemo claudit; claudis, et nemo aperit: veni, et ēduc vinctum dē domō carceris, sedentem in tenebrīs, et umbrā mortis.
F-D: Grammar Notes
This antiphon addresses Christ directly using the vocative O. The relative pronoun qui (who) introduces the relative clause describing Christ’s divine authority. Note the chiastic structure: aperis...claudit / claudis...aperit (you open...no one closes / you close...no one opens). The imperatives veni (come) and ēduc (lead forth) invoke Christ’s advent. The phrase in tenebrīs et umbrā mortis echoes Isaiah 9:2 and Psalm 107:10.
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Part A: Interlinear Construed Text 166.16a Frāter brother-NOM Petre Peter-VOC hora hour-NOM est is portās gates-ACC claudere to.close
166.16b Frāter (ˈfra.ter) brother-NOM Petre (ˈpe.tre) Peter-VOC hora (ˈho.ra) hour-NOM est (est) is portās (ˈpor.tas) gates-ACC claudere (ˈklau̯.de.re) to.close
166.17a Ita so Pater Father-VOC statim immediately clausūrus about.to.close-NOM.M sum am
166.17b Ita (ˈi.ta) so Pater (ˈpa.ter) Father-VOC statim (ˈsta.tim) immediately clausūrus (klau̯ˈzu.rus) about.to.close-NOM.M sum (sum) am
166.18a Primum first jānuam door-ACC orientālem eastern-ACC claude close-IMPV
166.18b Primum (ˈpri.mum) first jānuam (ˈja.nu.am) door-ACC orientālem (o.ri.enˈta.lem) eastern-ACC claude (ˈklau̯.de) close-IMPV
166.19a Jānua door-NOM orientālis eastern-NOM.F jam now clausa closed-NOM.F est is
166.19b Jānua (ˈja.nu.a) door-NOM orientālis (o.ri.enˈta.lis) eastern-NOM.F jam (jam) now clausa (ˈklau̯.za) closed-NOM.F est (est) is
166.20a Nunc now frātrēs brothers-NOM ad to cellās cells-ACC redeant let.return-SUBJ
166.20b Nunc (nuŋk) now frātrēs (ˈfra.tres) brothers-NOM ad (ad) to cellās (ˈtʃel.las) cells-ACC redeant (ˈre.de.ant) let.return-SUBJ
166.21a Unusquisque each.one-NOM in in cubiculō chamber-ABL suō his-ABL clausō closed-ABL ostiō door-ABL ōret let.pray-SUBJ
166.21b Unusquisque (u.nus.ˈkwis.kwe) each.one-NOM in (in) in cubiculō (ku.biˈku.lo) chamber-ABL suō (ˈsu.o) his-ABL clausō (ˈklau̯.zo) closed-ABL ostiō (ˈos.ti.o) door-ABL ōret (ˈo.ret) let.pray-SUBJ
166.22a Memento remember-IMPV verbī of.word-GEN Dominī of.Lord-GEN in in Evangeliō Gospel-ABL
166.22b Memento (meˈmen.to) remember-IMPV verbī (ˈver.bi) of.word-GEN Dominī (ˈdo.mi.ni) of.Lord-GEN in (in) in Evangeliō (e.vanˈge.li.o) Gospel-ABL
166.23a Cum when ōrāveris pray-PERF.SUBJ.2SG intra enter-IMPV in into cubiculum chamber-ACC tuum your-ACC
166.23b Cum (kum) when ōrāveris (o.ˈra.ve.ris) pray-PERF.SUBJ.2SG intra (ˈin.tra) enter-IMPV in (in) into cubiculum (ku.ˈbi.ku.lum) chamber-ACC tuum (ˈtu.um) your-ACC
166.24a Et and clausō closed-ABL ostiō door-ABL ōrā pray-IMPV Patrem Father-ACC tuum your-ACC in in absconditō secret-ABL
166.24b Et (et) and clausō (ˈklau̯.zo) closed-ABL ostiō (ˈos.ti.o) door-ABL ōrā (ˈo.ra) pray-IMPV Patrem (ˈpa.trem) Father-ACC tuum (ˈtu.um) your-ACC in (in) in absconditō (abs.konˈdi.to) secret-ABL
166.25a Deus God-NOM solus alone-NOM aperit opens et and claudit closes cor heart-ACC hominis of.man-GEN
166.25b Deus (ˈde.us) God-NOM solus (ˈso.lus) alone-NOM aperit (ˈa.pe.rit) opens et (et) and claudit (ˈklau̯.dit) closes cor (kor) heart-ACC hominis (ˈho.mi.nis) of.man-GEN
166.26a Sīcut just.as porta gate-NOM monastēriī of.monastery-GEN clausa closed-NOM.F est is mundō from.world-DAT
166.26b Sīcut (ˈsi.kut) just.as porta (ˈpor.ta) gate-NOM monastēriī (mo.nas.ˈte.ri.i) of.monastery-GEN clausa (ˈklau̯.za) closed-NOM.F est (est) is mundō (ˈmun.do) from.world-DAT
166.27a Ita so cor heart-NOM nostrum our-NOM claudātur let.be.closed-PASS.SUBJ vanitātibus vanities-DAT
166.27b Ita (ˈi.ta) so cor (kor) heart-NOM nostrum (ˈnos.trum) our-NOM claudātur (klau̯ˈda.tur) let.be.closed-PASS.SUBJ vanitātibus (va.ni.ˈta.ti.bus) vanities-DAT
166.28a Beāta blessed-NOM.F Virgō Virgin-NOM porta gate-NOM clausa closed-NOM.F vocātur is.called-PASS
166.28b Beāta (be.ˈa.ta) blessed-NOM.F Virgō (ˈvir.go) Virgin-NOM porta (ˈpor.ta) gate-NOM clausa (ˈklau̯.za) closed-NOM.F vocātur (voˈka.tur) is.called-PASS
166.29a Christus Christ-NOM clavem key-ACC tenet holds regnī of.kingdom-GEN cælōrum of.heavens-GEN
166.29b Christus (ˈkris.tus) Christ-NOM clavem (ˈkla.vem) key-ACC tenet (ˈte.net) holds regnī (ˈreŋ.ni) of.kingdom-GEN cælōrum (tʃeˈlo.rum) of.heavens-GEN
166.30a Nox night-NOM venit comes portæ gates-NOM clausæ closed-NOM.F.PL sunt are pax peace-NOM vōbīscum with.you-ABL
166.30b Nox (noks) night-NOM venit (ˈve.nit) comes portæ (ˈpor.te) gates-NOM clausæ (ˈklau̯.ze) closed-NOM.F.PL sunt (sunt) are pax (paks) peace-NOM vōbīscum (vo.ˈbis.kum) with.you-ABL
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