1. retention, keeping, holding, possession, ownership

usage: the act of retaining something

2. memory, retention, retentiveness, retentivity, faculty, mental faculty, module

usage: the power of retaining and recalling past experience; "he had a good memory when he was younger"

3. retentiveness, retentivity, retention, impermeability, impermeableness

usage: the power of retaining liquid; "moisture retentivity of soil"

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See also: retention (Dictionary)