To serve. 1. To work for; to labor in behalf of; to exert one's self continuously or statedly for the benefit of; to do service for; to be in the employment of, as an inferior, domestic, serf, slave, hired assistant, official helper, etc.; specifically, in a religious sense, to obey and worship. 2. To be a servant or a slave; to be employed in labor or other business for another; to be in subjection or bondage; to render menial service.