noun
relaxation
ree-lak-SAY-shun/ˌriːlækˈseɪʃn/
The easing of tension toward a less strained state.
The woman's peaceful rest in the hammock brings relaxation.

Etymology
The action noun turns loosening into an easing or mitigation. Its uses for relief from burdens, work, and ordinary cares connect that physical image with becoming less tense.
In context
For a prey animal, relaxation is an act of vulnerability.
More examples
- The massage promotes relaxation in her tight shoulder muscles.
- A relaxation of the dress code allows employees to wear jeans.
- After the disturbance, the system's relaxation toward equilibrium takes several seconds.
Forms
relaxation · relaxations
relax verb — To make or become less tense.