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From The Collaborative International Dictionary of English v.0.48:
Nocturn \Noc"turn\, n. [F. nocturne, fr. L. nocturnus. See Nocturnal, and cf. Nocturne.] 1. An office of devotion, or act of religious service, by night. [1913 Webster] 2. One of the portions into which the Psalter was divided, each consisting of nine psalms, designed to be used at a night service. --Hook. [1913 Webster]