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sub·sti·tu·tion (sŭb′stĭ-tshən, -ty-)
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n.
1.
a. The act or process of substituting: the substitution of human workers with robots.
b. An instance of this: made several substitutions to the recipe.
2. One that is substituted; a substitute; a replacement: proposed drug therapy as a substitution for surgery.
sub′sti·tution·al, sub′sti·tution·ar′y adj.
sub′sti·tution·al·ly adv.
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:

    Indo-European Roots

    Semitic Roots

    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.

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