Etymology
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sectarianism (n.)

1670s, "disposition to petty sects in opposition to things established" [Johnson], "state or character of being sectarian, excessive attachment to a particular sect;" see sectarian + -ism. An older word was sectarism (1640s), from sectary.

updated on March 25, 2022

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Definitions of sectarianism from WordNet

sectarianism (n.)
a narrow-minded adherence to a particular sect or party or denomination;
he condemned religious sectarianism
Synonyms: denominationalism
From wordnet.princeton.edu, not affiliated with etymonline.