a. often Revolutionary Relating to or being a revolution: revolutionary war; a museum of the Revolutionary era.
b. Bringing about or supporting a political or social revolution: revolutionary pamphlets.
2. Marked by or resulting in radical change: a revolutionary discovery.
n. pl. rev·o·lu·tion·ar·ies
1. A militant in the struggle for revolution.
2. A supporter of revolutionary principles.
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.