tr.v. sub·stan·ti·at·ed, sub·stan·ti·at·ing, sub·stan·ti·ates
1. To prove the truth of or support with proof or evidence: substantiate an accusation. See Synonyms at confirm.
2. To give substance to; make real or actual.
[New Latin substantiāre, substantiāt-, from Latin substantia, substance; see SUBSTANCE.]
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.