Entry 2 senses · 2 variants Webster, 1913 Retentive · Re·ten·tive · IPA /ɹɪˈtɛntɪv/ a. n. 01 a. Having power to retain; as, a retentive memory. 1. Having power to retain; as, a retentive memory. “Nor airless dungeon, nor strong links of iron, Can be retentive to the strength of spirit.” — Shak. 02 n. That which retains or confines; a restraint. 1. That which retains or confines; a restraint.[R.]