retentiveness

(noun) the power of retaining and recalling past experience. Synonyms: memory, retention, retentivity. Example: "He had a good memory when he was younger."

(noun) the property of retaining possessions that have been acquired. Synonyms: retentivity.

(noun) the power of retaining liquid. Synonyms: retentivity, retention. Example: "Moisture retentivity of soil."