n. Trading; mercantile business; trafficking.n. Mutual discussion and arrangement of the terms of a transaction or agreement, whether directly or by agents or intermediaries; the act or process of treating with another or others in regard to the settlement of some matter, or for the purchase or sale of a commodity, etc.: as, the negotiation of a treaty or a loan.n. In com., the act or procedure by which a bill of exchange, etc., is made negotiable—that is, made capable, by acceptance and indorsement, of being passed from hand to hand in payment of indebtedness, or of being transferred to another for a consideration. See negotiable.