retentivity

from 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}]

from 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]