Of or pertaining to retention / retaining

That which is retained.

plural of retent

plural of retentivity

Alternative spelling of anal-retentive

(Freudian psychology) Preoccupied with achieving perfection, order and control and with collecting, possessing, and retaining objects. / (by extension) Overly obsessive concerning small details.

(travel) A future-dated line of text put in to an airline reservation system or GDS to delay the booking being moved to archives.

plural of retention line

plural of retention tank

A tank for the retention of toilet waste, e.g. on a train.