Etymology
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relaxation (n.)

late 14c., relaxacioun, "a rupture, a hernia" (a sense now obsolete); mid-15c., "remission of a burden or penalty," from Old French relaxacion (14c.) and directly from Latin relaxationem (nominative relaxatio) "an easing, mitigation, relaxation," noun of action from past-participle stem of relaxare "loosen, open, stretch out" (see relax).

Meaning "relief from hard work or ordinary cares; a state or occupation intended to give mental or bodily relief after effort or ordinary occupations and cares" is from 1540s. Sense of "remission or abatement of rigor or intensity" is from 1690s.

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Definitions of relaxation

relaxation (n.)
(physiology) the gradual lengthening of inactive muscle or muscle fibers;
relaxation (n.)
(physics) the exponential return of a system to equilibrium after a disturbance;
Synonyms: relaxation behavior
relaxation (n.)
a feeling of refreshing tranquility and an absence of tension or worry;
Synonyms: easiness
relaxation (n.)
an occurrence of control or strength weakening;
the relaxation of requirements
Synonyms: loosening / slackening
relaxation (n.)
freedom from activity (work or strain or responsibility);
Synonyms: rest / ease / repose
relaxation (n.)
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;
Synonyms: relaxation method
relaxation (n.)
the act of making less strict;
From wordnet.princeton.edu