Webster's Revised Unabridged Dictionary · 1913

Accessory

Accessory (#; 277) , adjective

[Latin accessorius. See Access, and compare Accessary.]

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.

Ash accents the antepenult; and this is not only more regular, but preferable, on account of easiness of pronunciation. Most orhoepists place the accent on the first syllable.

Accessory ({not transcribed}) , noun

1.
That which belongs to something else deemed the principal; something additional and subordinate.
The aspect and accessories of a den of banditti. — Carlyle
2.
(Law) Same as Accessary, n.
3.
(Fine Arts) Anything that enters into a work of art without being indispensably necessary, as mere ornamental parts. — Elmes