- Zeal is defined as passion or enthusiasm for something.
An example of zeal is a passionate dedication for homeless rights.
zeal definition by Webster's New World
Origin: Middle English zele ; from Ecclesiastical Late Latin zelus, zeal, emulation ; from Classical Greek zēlos, zeal, ardor ; from Indo-European base an unverified form yā-, to be excited, praise from source Old Church Slavonic jaru, furious
zeal definition by American Heritage Dictionary
Origin: Middle English zele, from Old French zel, from Late Latin zēlus, from Greek zēlos.