1. Physical or mental strength, energy, or force: Our vigor was depleted by the hot weather.
2. The capacity for natural growth and survival, as of plants or animals.
3. Strong feeling; enthusiasm or intensity: argued his point with great vigor.
[Middle English, from Old French, from Latin, from vigēre, to be lively; see weg- in the Appendix of Indo-European roots.]
Synonyms: vigor, dash1, punch2, verve, vim, vitality
These nouns denote a quality of spirited force or energy: intellectual vigor; played the piano with dash; an editorial with real punch; painted with verve; arguing with his usual vim; a decreased mental vitality.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.