sectarianism Meaning, Definition & Usage

  1. noun a narrow-minded adherence to a particular sect or party or denomination
    denominationalism.
    • he condemned religious sectarianism

WordNet

Sec*ta"ri*an*ism noun
Definitions
  1. The quality or character of a sectarian; devotion to the interests of a party; excess of partisan or denominational zeal; adherence to a separate church organization.

Webster 1913