acquiesce (v.) Look up acquiesce at Dictionary.com
1610s, from Middle French acquiescer (16c.), from Latin acquiescere "to become quiet, remain at rest," thus "be satisfied with," from ad- "to" (see ad-) + quiescere "to become quiet," from quies (genitive quietis) "rest, quiet" (see quiet (n.)). Related: Acquiesced; acquiescing.