Main Entry: re·ten·tion

Pronunciation: \ri-ˈten-chən\

Function: noun

1 : the act of retaining: as a : abnormal retaining of a fluid or secretion in a body cavity <retention of urine> <retention of bile> b : the holding in place of a tooth or dental replacement by means of a retainer
2 : a preservation of the aftereffects of experience and learning that makes recall or recognition possible