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inter- +‎ sum



intersum (present infinitive interesse, perfect active interfuī, future participle interfutūrus); irregular conjugation

  1. I am or lie between
  2. I am apart
  3. I differ
  4. I am present, attend (+ dative)
  5. (impersonal) It makes a difference; it concerns; it matters


Irregular conjugation.

   Conjugation of intersum (highly irregular, suppletive, active only)
indicative singular plural
first second third first second third
active present intersum interes interest intersumus interestis intersunt
imperfect intereram intererās intererat intererāmus intererātis intererant
future intererō intereris, interere intererit intererimus intereritis intererunt
perfect interfuī interfuistī interfuit interfuimus interfuistis interfuērunt, interfuēre
pluperfect interfueram interfuerās interfuerat interfuerāmus interfuerātis interfuerant
future perfect interfuerō interfueris interfuerit interfuerimus interfueritis interfuerint
subjunctive singular plural
first second third first second third
active present intersim intersīs intersit intersīmus intersītis intersint
imperfect interessem, interforem interessēs, interforēs interesset, interforet interessēmus, interforēmus interessētis, interforētis interessent, interforent
perfect interfuerim interfuerīs interfuerit interfuerimus interfueritis interfuerint
pluperfect interfuissem interfuissēs interfuisset interfuissēmus interfuissētis interfuissent
imperative singular plural
first second third first second third
active present interes intereste
future interestō interestō interestōte intersuntō
non-finite forms active passive
present perfect future present perfect future
infinitives interesse interfuisse interfutūrus esse, interfore
participles interfutūrus



  • intersum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • intersum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • intersum in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to be present at secret consultations: consiliis arcanis interesse (Liv. 35. 18)
    • to attend lectures: scholis interesse
    • to take part in divine service (of the priest): rebus divinis interesse (B. G. 6. 13)
    • to take part in the engagement: proelio interesse