vigor

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vig·or / ˈvigər/ (Brit. vig·our) • n. 1. physical strength and good health. ∎  effort, energy, and enthusiasm: they set about the new task with vigor. ∎  strong, healthy growth of a plant.2. Law legal or binding force; validity.DERIVATIVES: vig·or·less / ˈvigərləs/ adj.