n. Rigid adherence to a particular sect, party or denomination.
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. The state or character of being sectarian; adherence to a separate religious sect or party; especially, excessive partizan or denominational zeal.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a narrow-minded adherence to a particular sect or party or denomination
Word Usage
"The term sectarianism originated with the Protestant Reformation starting in the 1500s."