I. ˌärt ə nˈpärt noun
Etymology: Middle English; art, probably from Old French hart segment (in the expression ne hart ne part nothing at all), branch, willow withe, noose, of Germanic origin; perhaps akin to Old English heordan hurds — more at hurds
Scots law : indirect participation in a crime by instigating, counseling, or assisting the actual perpetrator
II. adverb
Scots law : by being an accessory before the fact or an accomplice in a crime
pronounced guilty art and part