Pronunciation: /sɛkˈtɛːrɪən/
adjective
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denoting or concerning a sect or sects: the city’s traditional sectarian divide
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(of an action) carried out on the grounds of membership of a sect, denomination, or other group: sectarian killings
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rigidly following the doctrines of a sect or other group: the sectarian Bolshevism advocated by Moscow
noun
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a member of a sect: a Jewish sectarian who preached the redemption of the Gentiles
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a person who rigidly follows the doctrines of a sect or other group: he became a target as a sectarian who had apparently denounced one liberal-minded reformer as ‘degenerate’

Derivatives
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noun -
(also sectarianise) verb