1. A mass said or sung for the repose of a departed soul. We should profane the service of the dead To sing a requiem and such rest to her As to peace-parted souls. (Shak)
2. Any grand musical composition, performed in honor of a deceased person.
3. Rest; quiet; peace. Else had I an eternal requiem kept, And in the arms of peace forever slept. (Sandys)
Origin: Acc. Of L. Requies rest, the first words of the Mass being Requiem aeternam dona eis, Domine, give eternal rest to them, O lord; pref. Re- re _ quies quiet. See Quiet, and cf. Requin.