LATIN DICTIONARYLexicon Latīnum
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“effect” in Latin

The English word effect itself goes back to Latin faciō, through effectus.

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

effect
effectus (both the efficient power contained in anything and the effected consequence): vis (power): (The words are found in this connection and order.) vis et effectus: efficientia (efficient power): impulsus (impulse): appulsus (the approach of an efficient cause, especially of the sun; then, generally, the operation of one thing on another): eventus (result): The slow effect of medicine, tarditas medicinae: to take effect, to be of effect, vim habere (not vim exserere); efficacem esse (of medicines, etc.): to have the same effect, eosdem effectus habere: the medicine is taking effect, venis concipitur medicina; is of no effect, medicamentum imbecillius est, quam morbus: to have no effect, irrttum or frustra esse: to take effect upon anything, vim habere ad aliquid, or in aliqua re; vim exercere in aliquid (☞ not vim exserere in aliquid, which is not Latin): to take effect on anybody, effectu esse erga aliquem (of medicines); efficacem esse ad aliquem (of medicines and other things); aliquem or alicujus animum movere, or commovere (of what affects the mind): to have great effect upon anybody, alicujus animum vehementer movere or percutere: prayers which seldom miss of their effect upon female hearts, preces, quae ad muliebre ingenium efficaces sunt (Liv.): to have a different effect upon different minds, varie animos efficere: to have a good effect, boni aliquid efficere: to have a beneficial effect upon anybody, salubrem vim in aliquem exercere; alicui prodesse: to have an injurious effect upon anybody, alicui nocere. Without effect; to no effect, sine effectu: frustra (in vain): without any effect, sine ullo effectu: what is of little effect, or without effect, parum efficax (☞ inefficax post-classical). To bring to full effect, perficere; ad effectum adducere or perducere (☞ aliquid effectum dare, tradere, etc., is old Latin). To do in effect (= to as good as do) may often be translated by cum with the indicative; the sentence “to do this is, in effect, to do,” being turned into the form “when you do this, you do,” etc. Thus, this is, in effect, to say; or to say this, in effect, to say, cum hoc dico (dicis, dicit) ... dico (dicis, dicit; e.g., cum in portum dico, in urbem dico): to name these tribes was, in effect, to say that you had rather be tried by judges who did not know you than by judges who did, cum has tribus edidisti, ignotis te judicibus, quam notis, uti malle indicasti.
In effect, re: revera: reapse: re et veritate (in reality, not in words only): sane: profecto (assuredly): non verbis, sed re: as it was in effect, ut erat (e.g., multis, ut erat, atrox videbatur ejus sententia).
The purpose or general tenor of a speech, etc. The speech was to this effect, orationis summa erat: the letter was to this effect, epistola his verbis conscripta erat; in epistola scriptum erat his fere verbis: a letter to the same effect, in eandem rationem scripta epistola: Caes. said a good deal more to the same effect, multa a Caesare in eandem sententiam dicta sunt: to that effect (= end), that, etc., hac mente. hoc consilio (ut) etc.
Effects, res: bona. My, thy, etc., effects, mostly by neuter plur. of possessive pronoun. I carry all my effects with me, omnia mea mecum porto.
effect v.
ad effectum adducere (☞ aliquid effectum dare, tradere, reddere, are prae-classical): efficere: ad exitum adducere: ad finem perducere: absolvere: perficere. SYN. in ACCOMPLISH.

Quick answer

What is the Latin word for effect?
The usual Latin words for “effect” are efficiō, volō, impellō; also appellō, ēventus, bonus. 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.