From Proto-Indo-European *h₂epo ‎(off, from) (whence ab) + Proto-Indo-European *h₂wer- ‎(to cover, shut). Related to operiō.



aperiō ‎(present infinitive aperīre, perfect active aperuī, supine apertum); fourth conjugation

  1. I uncover
  2. I open


   Conjugation of aperio (fourth conjugation)
indicative singular plural
first second third first second third
active present aperiō aperīs aperit aperīmus aperītis aperiunt
imperfect aperiēbam aperiēbās aperiēbat aperiēbāmus aperiēbātis aperiēbant
future aperiam aperiēs aperiet aperiēmus aperiētis aperient
perfect aperuī aperuistī aperuit aperuimus aperuistis aperuērunt, aperuēre
pluperfect aperueram aperuerās aperuerat aperuerāmus aperuerātis aperuerant
future perfect aperuerō aperueris aperuerit aperuerimus aperueritis aperuerint
passive present aperior aperīris, aperīre aperītur aperīmur aperīminī aperiuntur
imperfect aperiēbar aperiēbāris, aperiēbāre aperiēbātur aperiēbāmur aperiēbāminī aperiēbantur
future aperiar aperiēris, aperiēre aperiētur aperiēmur aperiēminī aperientur
perfect apertus + present active indicative of sum
pluperfect apertus + imperfect active indicative of sum
future perfect apertus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present aperiam aperiās aperiat aperiāmus aperiātis aperiant
imperfect aperīrem aperīrēs aperīret aperīrēmus aperīrētis aperīrent
perfect aperuerim aperuerīs aperuerit aperuerīmus aperuerītis aperuerint
pluperfect aperuissem aperuissēs aperuisset aperuissēmus aperuissētis aperuissent
passive present aperiar aperiāris, aperiāre aperiātur aperiāmur aperiāminī aperiantur
imperfect aperīrer aperīrēris, aperīrēre aperīrētur aperīrēmur aperīrēminī aperīrentur
perfect apertus + present active subjunctive of sum
pluperfect apertus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present aperī aperīte
future aperītō aperītō aperītōte aperiuntō
passive present aperīre aperīminī
future aperītor aperītor aperiuntor
non-finite forms active passive
present perfect future present perfect future
infinitives aperīre aperuisse apertūrus esse aperīrī apertus esse apertum īrī
participles aperiēns apertūrus apertus aperiendus
verbal nouns gerund supine
nominative genitive dative/ablative accusative accusative ablative
aperīre aperiendī aperiendō aperiendum apertum apertū

Derived termsEdit




  • aperio in Charlton T. Lewis & Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • aperio in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • aperio in Félix Gaffiot (1934), Dictionnaire Illustré Latin-Français, Paris: Hachette.
  • Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to open a route: viam patefacere, aperire
    • to uncover one's head: caput aperire (opp. operire)
    • to freely express one's opinions: sententiam suam aperire
    • to make an obscure notion clear by means of definition: involutae rei notitiam definiendo aperire (Or. 33. 116)
    • to explain one's sentiments: sententias (verbis) explicare, aperire
    • to open a letter: epistulam solvere, aperire, resignare (of Romans also linum incīdere)
    • to open, shut the door: ostium, fores aperire, claudere
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