[syn: retentiveness, retentivity, retention]
The Collaborative International Dictionary of English v.0.48:
Retentivity \Re`ten*tiv"i*ty\, n.
   The power of retaining; retentive force; as, the retentivity
   of a magnet.
   [1913 Webster]
WordNet (r) 3.0 (2006):
retentivity
    n 1: the power of retaining and recalling past experience; "he
         had a good memory when he was younger" [syn: memory,
         retention, retentiveness, retentivity]
    2: the property of retaining possessions that have been acquired
       [syn: retentiveness, retentivity]
    3: the power of retaining liquid; "moisture retentivity of soil"
       [syn: retentiveness, retentivity, retention]