#1 relaxation n. (physiology) the gradual lengthening of inactive muscle or muscle fibers. wn
#2 relaxation n. [relaxation behavior] (physics) the exponential return of a system to equilibrium after a disturbance. wn
#3 relaxation n. [easiness] a feeling of refreshing tranquility and an absence of tension or worry; "the easiness we feel when sleeping". wn
#4 relaxation n. [loosening, slackening] an occurrence of control or strength weakening; "the relaxation of requirements"; "the loosening of his grip"; "the slackening of the wind". wn
#5 relaxation n. [rest, ease, repose] freedom from activity (work or strain or responsibility); "took his repose by the swimming pool". wn
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