relaxation

(physiology) the gradual lengthening of inactive muscle or muscle fibers

(physics) the exponential return of a system to equilibrium after a disturbance

a feeling of refreshing tranquility and an absence of tension or worry; "the easiness we feel when sleeping"

an occurrence of control or strength weakening; "the relaxation of requirements"; "the loosening of his grip"; "the slackening of the wind"

freedom from activity (work or strain or responsibility); "took his repose by the swimming pool"

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

the act of making less strict