Polygamy (from πολύς γάμος polys gamos, translated literally in Late Greek as "often married") is a marriage which includes more than two partners. When a man is married to more than one wife at a time, the relationship is called polygyny, and there is no marriage bond between the wives; and when a woman is married to more than one husband at a time, it is called polyandry, and there is no marriage bond between the husbands. If a marriage includes multiple husbands and wives, it can be called group marriage. The term is used in related ways in social anthropology, sociobiology, sociology, as well as in popular speech. In social anthropology, polygamy is the practice of a person's making him/herself available for two or more spouses to mate with. In contrast, monogamy is a marriage consisting of only two parties. Like monogamy, the term is often used in a de facto sense, applying regardless of whether the relationships are recognized by the state (see marriage for a discussion on the extent to which states can and do recognize potentially and actually polygamous forms as valid). In sociobiology and zoology, polygamy is used in a broad sense to mean any form of multiple mating.