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From arbiter +‎ .



arbitror (present infinitive arbitrārī, perfect active arbitrātus sum); first conjugation, deponent

  1. I judge
  2. I witness, observe
  3. I believe, think, consider, am of the opinion
    • 405 CE, Jerome, Vulgate Iob.13.24
      cur faciem tuam abscondis et arbitraris me inimicum tuum
      Why hide you your face, And hold me for your enemy?


   Conjugation of arbitror (first conjugation, deponent)
indicative singular plural
first second third first second third
active present arbitror arbitrāris, arbitrāre arbitrātur arbitrāmur arbitrāminī arbitrantur
imperfect arbitrābar arbitrābāris, arbitrābāre arbitrābātur arbitrābāmur arbitrābāminī arbitrābantur
future arbitrābor arbitrāberis, arbitrābere arbitrābitur arbitrābimur arbitrābiminī arbitrābuntur
perfect arbitrātus + present active indicative of sum
pluperfect arbitrātus + imperfect active indicative of sum
future perfect arbitrātus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present arbitrer arbitrēris, arbitrēre arbitrētur arbitrēmur arbitrēminī arbitrentur
imperfect arbitrārer arbitrārēris, arbitrārēre arbitrārētur arbitrārēmur arbitrārēminī arbitrārentur
perfect arbitrātus + present active subjunctive of sum
pluperfect arbitrātus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present arbitrāre arbitrāminī
future arbitrātor arbitrātor arbitrantor
non-finite forms active passive
present perfect future present perfect future
infinitives arbitrārī, arbitrārier1 arbitrātus esse arbitrātūrus esse
participles arbitrāns arbitrātus arbitrātūrus arbitrandus
verbal nouns gerund supine
nominative genitive dative/ablative accusative accusative ablative
arbitrārī, arbitrārier1 arbitrandī arbitrandō arbitrandum arbitrātum arbitrātū

1The present passive infinitive in -ier is a rare poetic form which is attested for this verb.



  • arbitror in Karl Ernst Georges, Ausführliches lateinisch-deutsches Handwörterbuch
  • arbitror in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • arbitror in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • arbitror in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to feel superior to the affairs of life: res humanas infra se positas arbitrari
    • to consider a thing beneath one's dignity: aliquid infra se ducere or infra se positum arbitrari
  • arbitror in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016