3. (Mus.) To perform an accompanying part or parts in a composition.

Ac*com"ple*tive (&?;), a. [L. ad + complere, completum, to fill up.] Tending to accomplish. [R.]

Ac*com"plice (&?;), n. [Ac- (perh. for the article a or for L. ad) + E. complice. See Complice.]