1. (n.) An aide or helper; something additional and subordinate; as an accessory to a phone, an accessory to a crime\.

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.) Same as Accessary.

4. (n.) Anything that enters into a work of art without being indispensably necessary, as mere ornamental parts.

a party to abettor accessary accession accessories accident accidental accompaniment accompanying accomplice accomplice in crime accretion addenda addendum additament addition additional additive additory additum adjunct adjuvant adscititious adventitious aide ancillary annex annexation another appanage appanages appendage appendages appendant appendix appointments appurtenance appurtenances appurtenant ascititious assistant assisting associated attachment attendant attending augment augmentation auxiliary belongings casual choses choses in action choses in possession choses local choses transitory circumstantial coconspirator coda cohort coincident collaborator collateral colleague combined complement component concomitant concurrent confederate conjoint conspirator contingency contingent continuation contributory copartner corollary correlative cotenant coupled defendant doodad engaged extension extra extrapolation farther fellow fellow conspirator fixture fortuitous fostering fresh frill further happenstance helper helping implicated incidental increase increment inessential instrumental involved joined joint litigant litigationist litigator material things mere chance ministerial ministering ministrant more movables mutual new nonessential not-self nurtural nutricial offshoot other paired panel parallel paraphernalia partaker partaking participant participating participative participator participatory parties litigant partner party pendant perquisites personal effects plaintiff plus reinforcement secondary serving shareholder sharer sharing side effect side issue simultaneous socius criminis spare subordinate subservient subsidiary suitor superadded superaddition superfluous supernumerary supervenient supplement supplemental supplementary surplus tailpiece things trappings tributary twin ulterior undergirding unessential witness