cos·tume (kŏstm′, -tym′)
1. A style of dress, including garments, accessories, and hairstyle, especially as characteristic of a particular country, period, or people.
2. An outfit or a disguise worn on Mardi Gras, Halloween, or similar occasions.
3. A set of clothes appropriate for a particular occasion or season.
tr.v. (kŏ-stm, -stym, kŏstm′, -tym′) cos·tumed, cos·tum·ing, cos·tumes
1. To put a costume on; dress.
2. To design or furnish costumes for.
[French, from Italian, style, dress, from Old Italian, custom, ultimately (possibly via Vulgar Latin *cōnstūmen, *cōnstūmin-), from alteration of Latin cōnsuētūdō, cōnsuētūdin-; see CUSTOM.]
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.