(n) The work of soothing and/or state of being calm.
(n) Refreshment of body or brain; recreation: played golf for relaxation.
(n) A loosening or slackening.
Relaxation in Community Dictionary
The one thing in our lives that disappears at some point between middle school and freshman year that dosen't come-back until we're old and wrinkly and have absolutely nothing to do but view our grandchildren. by Elmira TorbertReport definition
the point after making love or siting naked in an extremely comfy chair (or both!) by Ling LaidlawReport definition