patriarchy

Concise Oxford English Dictionary © 2008 Oxford University Press:
patriarchy /ˈpeɪtrɪɑːki/

▶noun (pl. patriarchies)

• 1 a form of social organization in which the father or eldest male is the head of the family and descent is reckoned through the male line.

• 2 a system of society or government ruled by men.

– derivatives
patriarchal adjective,
patriarchally adverb.