(1):
(n.) Same as Accessary, n.
(2):
(a.) Accompanying as a subordinate; aiding in a secondary way; additional; connected as an incident or subordinate to a principal; contributing or contributory; said of persons and things, and, when of persons, usually in a bad sense; as, he was accessory to the riot; accessory sounds in music.
(3):
(n.) That which belongs to something else deemed the principal; something additional and subordinate.
(4):
(n.) Anything that enters into a work of art without being indispensably necessary, as mere ornamental parts.