Once a lesson is learned, good or bad, the knowledge will be retained for a long time to come.

Jones defeated Evans by unanimous decision at the event to retain his title for a third time.

Pallas retained his position in the treasury for a time.

At Aachen, he developed the theory of hydrodynamics, which would retain his interest for a long time.

Certain clerical, stock record, and lab employees will be retained for a time.

He retained the position only for a short time.

Most colonies had a Test Act, and several states retained them for a short time.

They do, however, have a remarkably long memory, and once a task is learned, it will be retained for a very long time.

Why retain for such a long time - five years - data which, according to the parties involved, are not used?

Gladstone retained his seat as a Liberal, for a time after 1859.