retentive

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re·ten·tive / riˈtentiv/ • adj. 1. (of a person's memory) having the ability to remember facts and impressions easily.2. (of a substance) able to absorb and hold moisture. ∎  chiefly Med. serving to keep something in place.DERIVATIVES: re·ten·tive·ly adv.re·ten·tive·ness n.