zealotry Definition

zealot
noun

1. often derog
A single-minded and determined supporter of a political cause, religion, etc.
Thesaurus: fanatic, extremist, enthusiast, partisan, devotee, follower, disciple, fan.
2. historical
A member of the Zealots, a militant Jewish sect in the first century ad, which was violently opposed to Roman rule in Palestine.
Form: Zealot

Derivative: zealotry
noun

Etymology: 13c as zelote: from Greek zelotes in sense 2.