Mid 17th century; earliest use found in Richard Flecknoe (c1605–?1677), poet and playwright. From classical Latin requiēscererequiesce + -ence, after quiescence.
Definition of requiescence in US English:
requiescence
nounˌrɛkwɪˈɛsns
A state of rest or repose; peace, quiet.
Origin
Mid 17th century; earliest use found in Richard Flecknoe (c1605–?1677), poet and playwright. From classical Latin requiēscere requiesce + -ence, after quiescence.