Complementarianism is a theological view held by some in Judaism, Christianity, and Islam, that men and women have different but complementary roles and responsibilities in marriage, family life, religious leadership, and elsewhere.
The word “complementary” and its cognates are currently used to denote this view. For some of those whose complementarian view is biblically-prescribed, these separate roles preclude women from specific functions of ministry within the Church, with the notable exception of the leadership role of the deaconess, in many Christian denominations. It assigns leadership roles to men and support roles to women, based on certain biblical passages. One of its precepts is that while women may assist in the decision making process, the ultimate authority for the decision is the purview of the male in marriage, courtship, and in the polity of churches subscribing to this view.