accessary/əkˈsɛs(ə)ɹi/EtymologyFrom Middle English accessarie, axcessary, excercary, from Medieval Latin accessārius.accessary means someone who accedes to some act, now especially a crime; one who contributes as an assistant or instigator to the commission of an offense. Lexicurio rates it Rare gem — a strength score of 83 out of 100.nounSomeone who accedes to some act, now especially a crime; one who contributes as an assistant or instigator to the commission of an offense.adjAccompanying as a subordinate; additional; accessory; especially, uniting in, or contributing to, a crime, but not as chief actor. See accessory.“To both their deaths ſhalt thou be acceſſary.”