Meaning of coefficient of restitution

coeffi'cient of restitu'tion

Pronunciation: [key]
— Physics. Physics.
  1. the ratio of the relative velocity after impact to the relative velocity before the impact of two colliding bodies, equal to 1 for an elastic collision and 0 for an inelastic collision.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.