apart (adv.) Look up apart at Dictionary.com
"to or at the side; by itself, away from others," late 14c., from Old French a part (Modern French à part) "to the side," from Latin ad "to" (see ad-) + partem, accusative of pars "a side" (see part (n.)). The first element is probably felt in English as a- as in abroad, ahead (see a- (1)). As an adjective from 1786.