How Well Do You Know English Slang?
late 14c., "giving heed," from Latin attentionem (nominative attentio) "attention, attentiveness," noun of action from past participle stem of attendere "mental heeding" (see attend). Used with a remarkable diversity of verbs (e.g. pay, gather, attract, draw, call). As a military cautionary word preparative to giving a command, it is attested from 1792.