Matriarchy is a social system in which women hold the primary power positions in roles of authority. In a broader sense it can also extend to moral authority, social privilege and control of property.
While those definitions apply in general English, definitions specific to anthropology and feminism differ in some respects.
Matriarchies may also be confused with matrilineal, matrilocal, and matrifocal societies. While there are those who may consider any non-patriarchal system to be matriarchal, most academics exclude those systems from matriarchies as strictly defined.
According to the Oxford English Dictionary (OED), matriarchy is a "form of social organization in which the mother or oldest female is the head of the family, and descent and relationship are reckoned through the female line; government or rule by a woman or women." A popular definition, according to James Peoples and Garrick Bailey, is "female dominance". Within the academic discipline of cultural anthropology, according to the OED, matriarchy is a "culture or community in which such a system prevails" or a "family, society, organization, etc., dominated by a woman or women" without reference to laws that require women to dominate. In general anthropology, according to William A. Haviland, matriarchy is "rule by women". A matriarchy is a society in which females, especially mothers, have the central roles of political leadership, moral authority, and control of property, but does not include a society that occasionally is led by a female for nonmatriarchal reasons or an occupation in which females generally predominate without reference to matriarchy, such as prostitution or women's auxiliaries of organizations run by men. According to Lawrence A. Kuzner in 1997, A. R. Radcliffe-Brown argued in 1924 that the definitions of matriarchy and patriarchy had "logical and empirical failings (...) [and] were too vague to be scientifically useful".
Most academics exclude egalitarian nonpatriarchal systems from matriarchies more strictly defined.