1: Presbyterian Church ( USA ) approved an amendment to its constitution after most of its 171 presbyteries -- or governing bodies -- voted for it , PC ( USA ) said Tuesday . 2: The new definition says , in part , that  marriage involves a unique commitment between two people , traditionally a man and a woman , to love and support each other for the rest of their lives .  3: Presbyterian Church ( USA ) will define marriage as a  commitment between two people 
1: amendment 2: new definition 3: define marriage as a `` commitment between two people