active strength or force.
healthy physical or mental energy or power; vitality.
energetic activity; energy; intensity: The economic recovery has given the country a new vigor.
force of healthy growth in any living matter or organism, as a plant.
active or effective force, especially legal validity.
Also, especially British, vigour.

1300–50; Middle English vigo(u)r < Anglo-French; Middle French vigeur < Latin vigor force, energy, equivalent to vig(ēre) to be vigorous, thrive + -or -or1

vigorless, adjective

2. drive, force, strength. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vigour or (US) vigor (ˈvɪɡə)
1.  exuberant and resilient strength of body or mind; vitality
2.  substantial effective energy or force: the vigour of the tempest
3.  forcefulness; intensity: the vigour of her complaints
4.  the capacity for survival or strong healthy growth in a plant or animal: hybrid vigour
5.  the most active period or stage of life, manhood, etc; prime
6.  chiefly (US) legal force or effectiveness; validity (esp in the phrase in vigour)
[C14: from Old French vigeur, from Latin vigor activity, from vigēre to be lively]
vigor or (US) vigor
[C14: from Old French vigeur, from Latin vigor activity, from vigēre to be lively]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, from Anglo-Fr. vigour, O.Fr. vigor, from L. vigorem (nom. vigor) "liveliness, activity, force," from vigere "be lively, flourish, thrive," from PIE *wog-/*weg- "be lively or active" (see vigil).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


see vim and vigor.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
It stirs the oceans with more vigor, and ever so slowly provides energy to the
  water world too.
No one questioned his renewed energy and vigor, because he had always been
Another type is meant to stimulate root growth, stem vigor, and flower and
  fruit production.
Mine look a little better than yours but remain stunted with no vine vigor
Idioms & Phrases
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