fa·ther noun 1. a man in relation to his child or children. "Margaret's father died at an early age" Similar: male parent birth father biological father begetter patriarch paterfamilias dad daddy pop poppa pa old boy old man adoptive father foster father stepfather pater 2. (often as a title or form of address) a priest. "pray for me, father" Similar: priest pastor parson clergyman father confessor churchman man of the cloth man of God cleric minister preacher abbé curé reverend padre verb (of a man) cause a pregnancy resulting in the birth of (a child). "he fathered three children"