1. The act of performing or the state of being performed.
2. The act or style of performing a work or role before an audience.
3. The way in which someone or something functions: The pilot rated the airplane's performance in high winds.
4. A presentation, especially a theatrical one, before an audience.
5. Something performed; an accomplishment.
6. Linguistics One's actual use of language in actual situations.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.