• (America) IPA: /əkˈsɛsəɹi/, /ækˈsɛsəɹi/
• (RP) IPA: /əkˈsɛs(ə)ɹi/, /ækˈsɛs(ə)ɹi/

accessary (plural accessaries)

1. (legal) Someone who accedes to some act, now especially a crime; one who contributes as an assistant or instigator to the commission of an offense.

accessary

1. (legal) Accompanying as a subordinate; additional; accessory; especially, uniting in, or contributing to, a crime, but not as chief actor. See accessory.
   • c. 1593, William Shakespeare, “The Tragedy of Richard the Third: […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act 1, scene 2]:

     To both their deaths thou shalt be accessary.