retentivity in WordNet English dictionary

1. the power of retaining and recalling past experience
   "he had a good memory when he was younger"
   memory  retention  retentiveness  retentivity 
   
2. the power of retaining liquid
   "moisture retentivity of soil"
   retentiveness  retentivity  retention 
   
3. the property of retaining possessions that have been acquired
   retentiveness  retentivity