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“aptness” in Latin

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

aptness
disposition, proclivitas or animus proclivis (ad aliquid).
Aptness for learning, ingenium ad aliquid aptum or habile; ingenii dexteritas; ingenium docile; docilitas: ingenii acumen. To have an aptness for any thing, habilem or aptum esse ad aliquid: a natural aptness, natum esse ad aliquid.
Fitness, convenientia (apt agreement; e.g., partium, rerum): congruentia (Suet.: morum, Augustin): habilitas (aptitude for any purpose: corporis habilitates, Cic..).

Quick answer

What is the Latin word for aptness?
The usual Latin words for “aptness” are prōclīvitās, conveniō, congruō; also habilitās, habilis, docilitās. 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.