Someone who accedes to some act, now especially a crime; one who contributes as an assistant or instigator to the commission of an offense.
Accompanying as a subordinate; additional; accessory; especially, uniting in, or contributing to, a crime, but not as chief actor. See accessory.
Something which can be appended to something else.
A software extension or hardware peripheral that provides additional functions or customization for a core application or system.
Additional chips that can be purchased at specific times in tournament play.