relaxation (Noun) — (physiology) the gradual lengthening of inactive muscle or muscle fibers.
relaxation (Noun) — (physics) the exponential return of a system to equilibrium after a disturbance.
relaxation (Noun) — A feeling of refreshing tranquility and an absence of tension or worry. ex. "the relaxation we feel when sleeping"
relaxation (Noun) — An occurrence of control or strength weakening. ex. "the relaxation of requirements"
relaxation (Noun) — Freedom from activity (work, strain or responsibility). ex. "took his relaxation by the swimming pool"
relaxation (Noun) — A method of solving simultaneous equations by guessing a solution and then reducing the errors that result by successive approximations until all the errors are less than some specified amount.
relaxation (Noun) — The act of making less strict.