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