Physical strength, energy, and determination; enthusiasm and effort in doing something.
From Old French 'vigour,' from Latin 'vigor' meaning 'liveliness' or 'force,' related to 'vigere' (to be lively). The British spelling 'vigour' preserves the original French form (American spelling is 'vigor').
In biology, 'hybrid vigor' is when crossing two different plant or animal populations produces offspring that are stronger and healthier than either parent—this is why genetic diversity is evolutionarily crucial.
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