1. A supplementary component; SYN. appurtenance, supplement.
2. Additional clothing that is worn or carried, but not part of one's main clothing (such as belts, scarves, or handbags); SYN. accoutrement, accouterment.
3. Someone who helps another person commit a crime; SYN. accomplice, accessary.

ETYM Ac- (perh. for the article a or for Latin ad) + Eng. complice. Related to Complice.
1. A helper.
2. An associate in the commission of a crime; a participator in an offense, whether a principal or an accessory.