First First, adv. Before any other person or thing in time, space, rank, etc.; -- much used in composition with adjectives and participles. Adam was first formed, then Eve. --1 Tim. ii. 13. At first, At the first, at the beginning or origin. First or last, at one time or another; at the beginning or end. And all are fools and lovers first or last. --Dryden., First First, n. (Mus.) The upper part of a duet, trio, etc., either vocal or instrumental; -- so called because it generally expresses the air, and has a pre["e]minence in the combined effect.