relaxation

noun

• The act of relaxing or the state of being relaxed; the opposite of stress or tension; the aim of recreation and leisure activities.
• A diminution of tone, tension, or firmness; specifically in pathology: a looseness; a diminution of the natural and healthy tone of parts.

  "relaxation of the soft palate"

• Remission or abatement of rigor.
• Remission of attention or application.

  "relaxation of efforts"

• Unbending; recreation; a state or occupation intended to give mental or bodily relief after effort.
• The transition of an atom or molecule from a higher energy level to a lower one.
• The release following musical tension.