ETYM Acc. of Latin requies rest, the first words of the Mass beinggive eternal rest to them, O lord; pref. re- re + quies quiet. Related to Quiet, Requin.
1. A mass said or sung for the repose of a deceased person.
2. Any grand musical composition, performed in honor of a deceased person.

1. A Mass celebrated for the dead.
2. A musical setting for a Mass celebrating the dead.
Lament or mass for the dead
Mass or dirge for the dead.
In the Roman Catholic Church, a mass for the dead. Musical settings include those by Palestrina, Mozart, Berlioz, Verdi, Fauré, and Britten.