relaxation

Short definition from Wiktionary

Noun

1. 1
   The act of relaxing or the state of being relaxed; the opposite of stress or tension; the aim of recreation and leisure activities.
2. 2
   A diminution of tone, tension, or firmness; specifically in pathology: a looseness; a diminution of the natural and healthy tone of parts.
3. 3
   Remission or abatement of rigor.
4. 4
   Remission of attention or application.
5. 5
   Unbending; recreation; a state or occupation intended to give mental or bodily relief after effort.
6. 6
   The transition of a nucleus, atom or molecule from a higher energy level to a lower one; the opposite of excitation
7. 7
   The release following musical tension.