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retentive (adj.)

late 14c., retentif, "able to hold or keep" (food, nourishment), from Old French retentif, from Medieval Latin retentivus, from past-participle stem of Latin retinere "to hold back, retain" (see retain).

The mental sense of "good at remembering, having a good memory" is from early 15c. The general sense of "having the property of retaining or keeping" is from 1580s. Related: Retentively; retentiveness.

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Definitions of retentive from WordNet

retentive (adj.)
good at remembering;
a retentive mind
Synonyms: recollective / long / tenacious
retentive (adj.)
having the capacity to retain something;
retentive (adj.)
having the power, capacity, or quality of retaining water;
soils retentive of moisture
From wordnet.princeton.edu