Etymology
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vigor (n.)

c. 1300, "physical strength, energy in an activity," from Anglo-French vigour, Old French vigor "force, strength" (Modern French vigueur), from Latin vigorem (nominative vigor) "liveliness, activity, force," from vigere "be lively, flourish, thrive," from PIE root *weg- "to be strong, be lively."

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Definitions of vigor

vigor (n.)
forceful exertion;
Synonyms: energy / vigour / zip
vigor (n.)
active strength of body or mind;
Synonyms: vigour / dynamism / heartiness
vigor (n.)
an imaginative lively style (especially style of writing);
Synonyms: energy / muscularity / vigour / vim
From wordnet.princeton.edu