relaxation

re·lax·ation

noun
\ˌrē-ˌlak-ˈsā-shən, ri-ˌlak-, especially British ˌrel-ək-\

Definition of RELAXATION

1

: the act of relaxing or state of being relaxed <maximal abdominal relaxation was not evident until at least five minutes after the injection—Lancet>

2

: the reduction of contractile force in a muscle or muscle fiber; especially : the lengthening that typically characterizes inactive muscles or muscle fibers