Vigour definitions

vĭg'ər
Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
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(biology) Strength or force in animal or force in animal or vegetable nature or action.

A plant grows with vigour.

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Strength; efficacy; potency.
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Origin of vigour

From Middle English, from Anglo-Norman vigour, from Old French vigor, from Latin vigor, from vigeo (“thrive, flourish"), from Proto-Indo-European.