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.
• Remission or abatement of rigor.
• Remission of attention or application.
• Unbending; recreation; a state or occupation intended to give mental or bodily relief after effort.
• (physics) The transition of a nucleus, atom or molecule from a higher energy level to a lower one; the opposite of excitation
• (music) The release following musical tension.