definition of
retentivity

[1] #1 retentivity n. [memory, retention, retentiveness] the power of retaining and recalling past experience; "he had a good memory when he was younger". wn

[2] #2 retentivity n. [retentiveness] the property of retaining possessions that have been acquired. wn

[3] #3 retentivity n. [retentiveness, retention] the power of retaining liquid; "moisture retentivity of soil". wn