adj. might·i·er, might·i·est
1. Having or showing great power, skill, strength, or force: a mighty orator; a mighty blow.
2. Imposing or awesome in size, degree, or extent: a mighty stone fortress.
To a great degree; extremely. Used as an intensive: mighty fine; mighty tired. See Note at powerful.
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.