Relaxation

noun
1.
abatement or relief from bodily or mental work, effort, application, etc.
2.
an activity or recreation that provides such relief; diversion; entertainment.
3.
a loosening or slackening.
4.
diminution or remission of strictness or severity.
5.
Mathematics. a numerical procedure for solving systems of equations by successive approximations of the variables.
6.
Physics.

the return of a system undergoing dissipation to an initial state of equilibrium after being displaced from it.
the approach to steady-state operation of a system that has undergone dissipation and a change in state or has been subjected to an abrupt periodic disturbance.

noun
1.
rest or refreshment, as after work or effort; recreation
2.
a form of rest or recreation: his relaxation is cricket
3.
a partial lessening of a punishment, duty, etc
4.
the act of relaxing or state of being relaxed
5.
(physics) the return of a system to equilibrium after a displacement from this state
6.
(maths) a method by which errors resulting from an approximation are reduced by using new approximations

relaxation re·lax·a·tion (rē’lāk-sā’shən)
n.

The act of relaxing or the state of being relaxed.

Refreshment of body or mind.

A loosening or slackening.

The lengthening of inactive muscle or muscle fibers.