late 14c., "ability, means, resources," from O.Fr. faculté, from L. facultatem (nom. facultas) "power, ability, wealth," from *facli-tat-s, from facilis (see facile). Academic sense was probably the earliest in English (attested in Anglo-L. from late 12c.), on notion
of "ability in knowledge." Originally each department was a faculty; the use in reference to the whole teaching staff of a college dates from 1767.