requiem

Definitions:

A hymn or mass sung for the repose of the soul of the dead, beginning with this word; a musical composition in honour of some dead person.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
A Mass sung for the repose of the souls of the dead; the music for such a Mass; any hymn cr solemn musical service in honor of the dead.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
A grand musical composition performed in the R. Cath. Ch. in honour of a deceased person, so called from " requiem," the first of the Latin words of the hymn; a musical mass for the repose of the soul of the dead.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
A hymn or mass sung for the quiet or rest of the soul of the dead: a grand musical composition in honor of the dead.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
Hymn or mass sung for the repose of departed souls.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)

Usage examples:

This magnificent epistle constitutes in some sense a solemn requiem to the old temple service with its altar and priesthood, where the blood of bulls and goats that can never take away sin had flowed for so many centuries.
- Companion to the Bible by E. P. Barrows
Are we to sing a requiem
- The Letters of Elizabeth Barrett Browning (1 of 2) by Frederic G. Kenyon
She had gone, taking with her the secret of her self- sacrifice and crime, and the night- winds moaning amidst the rocks sang their requiem over her.
- Jess by H. Rider Haggard