[Proper name.] St. Sylvester’s day, Dec. 31. Sylvester-eve, -night [G. Sylvesterabend], the evening or night of Dec. 31, New Year’s Eve.

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1838.  S. Jackson, trans. Strauss’ Remin. Early Life Lutheran Clergyman, I. 50. I have never been able to feel joyful on Sylvester-eve, when I have spent it wholly in company.

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1852.  Thackeray, Esmond, II. vii. And so the sylvester night passed away.

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1866.  Engel, Nat. Mus., viii. 276. In the villages of Northern Germany, it is not unusual for the cowherd,… at midnight of Sylvester, to … sing a sacred hymn.

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