LATIN DICTIONARYLexicon Latīnum
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“ability” in Latin

The English word ability itself goes back to Latin habeō, through habilitās.

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

ability
power, potentia (absolute power): potestas (power derived from legal authority): copia (possibility of doing anything with convenience): facultas (capacity; possibility subjectively).
Mental power, ingenium (connate mental power, talents, genius): sollertia (menta. dexterity, practical genius): docilitas (power of learning, of improving): ingenu facultas (talent for a particular pur suit, not talents coliectively, which is ingenium): facultas with genitive (power to do anything, e.g., to speak, dicendi). I do not give him credit for ability to accomplish something, aliquem aliquid efficere non posse duco (after Nep., Alcib., 7, 2).
Abilities, mental powers collectively; ingenium, facultates (Cic., de Invent., 1, 27, quite at the end); animi vis, virtus, hominis sollertia. To cultivate one’s abilities, animum mentemque excolere: to be a person of considerable abilities, ingeniosum esse, ingenio abundare.
Riches. Vid:

Quick answer

What is the Latin word for ability?
The usual Latin words for “ability” are potentia, potestās, cōpia; also facultās, ingenium, sollers. 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.