Definition 2024



See also: falló and fallò



fallo m (plural falli)

  1. fault, error
  2. foul (in sport)
  3. phallus



  1. first-person singular present indicative of fallare



  1. Compound of imperative of fare and lo.
    • Fallo ora!
      Do it now!




From Proto-Indo-European *ǵʰwel- (to lie, deceive). Cognate with Ancient Greek φῆλος (phêlos, deceitful), Sanskrit वृ (vṛ, twist, crook), Avestan 𐬰𐬎𐬭𐬀𐬵 (zurah, injustice) [script needed], Lithuanian žulas (rough), Latvian zvel'u (to turn aside), Old Church Slavonic зълъ (zŭlŭ, evil)



fallō (present infinitive fallere, perfect active fefellī, supine falsum); third conjugation

  1. I deceive, trick, cheat, disappoint.
  2. I mistake, am mistaken, deceive myself.
  3. I escape the notice of, am unseen.
  4. I appease, beguile.
  5. I swear falsely, perjure.


   Conjugation of fallo (third conjugation)
indicative singular plural
first second third first second third
active present fallō fallis fallit fallimus fallitis fallunt
imperfect fallēbam fallēbās fallēbat fallēbāmus fallēbātis fallēbant
future fallam fallēs fallet fallēmus fallētis fallent
perfect fefellī fefellistī fefellit fefellimus fefellistis fefellērunt, fefellēre
pluperfect fefelleram fefellerās fefellerat fefellerāmus fefellerātis fefellerant
future perfect fefellerō fefelleris fefellerit fefellerimus fefelleritis fefellerint
passive present fallor falleris, fallere fallitur fallimur falliminī falluntur
imperfect fallēbar fallēbāris, fallēbāre fallēbātur fallēbāmur fallēbāminī fallēbantur
future fallar fallēris, fallēre fallētur fallēmur fallēminī fallentur
perfect falsus + present active indicative of sum
pluperfect falsus + imperfect active indicative of sum
future perfect falsus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present fallam fallās fallat fallāmus fallātis fallant
imperfect fallerem fallerēs falleret fallerēmus fallerētis fallerent
perfect fefellerim fefellerīs fefellerit fefellerīmus fefellerītis fefellerint
pluperfect fefellissem fefellissēs fefellisset fefellissēmus fefellissētis fefellissent
passive present fallar fallāris, fallāre fallātur fallāmur fallāminī fallantur
imperfect fallerer fallerēris, fallerēre fallerētur fallerēmur fallerēminī fallerentur
perfect falsus + present active subjunctive of sum
pluperfect falsus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present falle fallite
future fallitō fallitō fallitōte falluntō
passive present fallere falliminī
future fallitor fallitor falluntor
non-finite forms active passive
present perfect future present perfect future
infinitives fallere fefellisse falsūrus esse fallī falsus esse falsum īrī
participles fallēns falsūrus falsus fallendus
verbal nouns gerund supine
nominative genitive dative/ablative accusative accusative ablative
fallere fallendī fallendō fallendum falsum falsū

Derived terms

Related terms

  • falsātiō
  • falsātus
  • falsidicentia
  • falsificātus



  • fallo in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • fallo in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • Félix Gaffiot (1934), “fallo”, in Dictionnaire Illustré Latin-Français, Paris: Hachette.
  • Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book, London: Macmillan and Co.
    • if I am not mistaken: nisi fallor
    • if I am not mistaken: nisi (animus) me fallit
    • unless I'm greatly mistaken: nisi omnia me fallunt
    • to deceive a person's hope: spem alicuius fallere (Catil. 4. 11. 23)
    • to keep one's word (not tenere): fidem servare (opp. fallere)
  • fallo in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700, pre-publication website, 2005-2016



fallo m (plural fallos)

  1. failure
  2. verdict, decision
  3. ruling



  1. First-person singular (yo) present indicative form of fallar.