Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From French acquiescement acquiescence from acquiescer + -ment.
Definition of acquiescement in US English:
acquiescement
nounˌakwɪˈɛsm(ə)nt
rare, non-standard
Acquiescence.
Origin
Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From French acquiescement acquiescence from acquiescer + -ment.