n. The act of one who undertakes or engages to do any business, office, or duty.n. That which is undertaken; a business, work, or project which a person engages in or attempts to perform; an enterprise.n. The business of an undertaker, or manager of funerals. A promise; an engagement; an obligation; a guaranty; specifically, in American law, a formal obligation entered into by or on behalf of a party to litigation, and usually with sureties, for the payment of money or performance of some act if it should be adjudged due or otherwise become required, such an obligation being usually required as a condition of taking some step in the action, as, for instance, appealing or issuing an order of arrest or attachment.Enterprising.