mes·si·a·nism (mĕsē-ə-nĭz′əm, mĭ-sī-)
1. Belief in a messiah.
2. Belief that a particular cause or movement is destined to triumph or save the world.
3. Zealous devotion to a leader, cause, or movement.
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.