LATIN DICTIONARYLexicon Latīnum
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“party” in Latin

The English word party itself goes back to Latin pars, through partire.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

party
An indefinite number, aliquot (some; of a quite indefinite number): complures (some; and several of them at least): a large party, copia, multitudo.
Faction, pars, partes, plur., (with reference to distinct interests or principles): factio (clique of partizans; political, or in a bad sense): globus, globus consensionis (as a number of persons united): secta (a philosophical party; seldom of a political one): a prevailing party, partes praevalidae, victrices (Tac.): a defeated or fallen party, partes desertae, lapsae: to be of anybody’s party, esse alicujus partis, alicujus partium (Cic.); sequi alicujus sectam (Liv., Cic., Tac.); sequi alicujus causam; in eadem esse cum aliquo causa; facere, stare, sentire cum aliquo (Cic.); rebus alicujus favere, studere (Caes.); sequi alicujus partes (Valerius Max.): the different parties in a state, aliorum alias partes foventium factiones: to belong to another party, aliarum esse partium; aliunde stare; alterius (or alius) rebus favere or studere: to go over, or attach one’s self to anybody’s party, se ad causam alicujus applicare (after Nep., Ar., 2, 3); partibus alicujus accedere (Tac.); transire, transgredi in alicujus partes (Tac.): of the popular party, populares (opposed to optimi cujusque studiosi): to make a party against anybody, stare cum aliquo adversus aliquem (Nep.): to be of no party, nullius partis esse: to be of neither party, neutrius partis esse: to support an opposite party, alias partes fovere, juvare: to divide into two parties, in duas partes discedere (Sall., Jug., 13, 1); in duas factiones scindi (Tac., Hist., 1, 13): the opposite party, pars adversa (general term): factio adversa or adversaria (in political disturbances): diversa factio (also in political disturbances, but as a party that pursues a different object; whereas pars and factio adversa refer to the other party as opponents): the strife of parties, partium contentio (Cic.): the leader of a party, dux partium (Tac.); princeps partis alicujus (Cic.); factionis princeps (Caes., Nep.); caput (Suet.); or from context, dux, caput only: party spirit, partium studium (Cic.); factionum parandarum studium; or simply, factio (Liv., 2, 30); studia (plur., ibid.); cupiditas (Cic.): devoted er attached to a party, alterius partis studiosus or cupidus; alteri parti, causae, studens, favens, addictus (after Caes.), or simply cupidus: a party man, homo partium studiosus; partes alicujus fovens ac juvans.
One of two litigants, adversarius; feminine, adversaria (Hor., Quint.); adversa pars. ☞ An orator usually designates the opposite party by iste, isti.
A select assembly, societas (Cic.).
Party of pleasure; a party into the country, excursio: a water party, navigatio: to be one of a party, una esse cum aliis: one of the same party, socius, comes [SYN. in COMPANION]: to join anybody’s party, alicui comitem se addere or adjungere: to make a party into the country, rus excurrere: to make a water party, navigare.
A detachment of soldiers, militum expedita manus, -ūs; factio (Suet.): a party of horsemen, equestris turma.

Quick answer

What is the Latin word for party?
The usual Latin words for “party” are aliquot, complūrēs, pars; also factiō, globus, secō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.