retention
re.ten.tion \ri-'ten-ch*n\ n [ME retencioun, fr. L retention-, retentio, fr. retentusX, pp. of retine-re to retain - more at RETAIN 1a: the act of retaining : the state of being retained 1b: abnormal retaining of a fluid or secretion in a body cavity 2a: power of retaining : RETENTIVENESS 2b: an ability to retain things in mind : MEMORY 3: something retained