LATIN DICTIONARYLexicon Latīnum
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“retentive” in Latin

The English word retentive itself goes back to Latin rĕtentus, through retentivus.

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

retentive
by circumlocution with the verbs in To RETAIN.A retentive memory, memoria bona (Cic., Att.), tenax: a more retentive memory, memoria melior (Cic.): a very retentive one, tenacissima (Quint.): to have a retentive memory, memoria valere, vigere. If preceded by “so” - (that), tantus. Anybody had so retentive a memory, that, alicui memoria tauta fuit, ut, etc. (e.g., Hortensio, Cic.).

Quick answer

What is the Latin word for retentive?
The usual Latin words for “retentive” are tenāx, vigeō, tantus; also Hortēnsius. 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.