a. The act or process of providing evidence for or showing the truth of something: a demonstration of the drug's efficacy; a demonstration of the theorem.
b. An illustration or explanation, as of a theory or product, by exemplification or practical application: a demonstration of ballroom dancing.
a. A piece of evidence: That car he bought is supposed to be a demonstration of his commitment to clean energy.
b. An expression or manifestation, as of one's feelings: a demonstration of her displeasure.
3. A public display of group opinion, as by a rally or march: peace demonstrations.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.