Definition from Wiktionary, the free dictionary
requiem (plural requiems)
- A mass (especially Catholic) to honor and remember a dead person.
- A musical composition for such a mass.
- A piece of music composed to honor a dead person.
Usage notes 
The Latin Introit, or opening prayer, for a requiem mass starts with the words:
- Requiem aeternam dona eis, Domine, et lux perpetua luceat eis.
- "Grant them eternal rest, Lord, and may everlasting light shine upon them."
Coordinate terms 
Related terms 
mass to honor and remember a dead person
musical composition composed for such a mass
piece of music composed to honor a dead person
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requiem m (invariable)
- accusative singular of requiēs