req·ui·em (rĕkwē-əm, rēkwē-)
1. Requiem Roman Catholic Church
a. A mass for a deceased person.
b. A musical composition for such a mass.
2. A hymn, composition, or service for the dead.
[Middle English, from Latin, accusative of requiēs, rest, the first word of the mass for the dead : re-, re- + quiēs, quiet; see kweiə- in the Appendix of Indo-European roots.]
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.