Meaning

noun forceful exertion

noun active strength of body or mind

noun an imaginative lively style (especially style of writing)

originFrom Middle English vigour, from Old French vigour, from vigor, from Latin vigor, from vigeō (“thrive, flourish”), from Proto-Indo-European *weǵ- (“to be lively”). Related to vigil, vegetable, vajra, and waker.

Etymology from Wiktionary, CC BY-SA 3.0