"retentivity" in the noun sense
1. memory, retention, retentiveness, retentivity
the power of retaining and recalling past experience
"he had a good memory when he was younger"
2. retentiveness, retentivity
the property of retaining possessions that have been acquired
3. retentiveness, retentivity, retention
the power of retaining liquid
"moisture retentivity of soil"
Source: WordNet® (An amazing lexical database of English)
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