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(Historical Terms) the fourth month of the French revolutionary calendar, extending from Dec 22 to Jan 20
[C18: via French from Latin nivōsus snowy, from nix snow]
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Noun1.Nivose - fourth month of the Revolutionary calendar (December and January); the snowy month
Revolutionary calendar - the calendar adopted by the first French Republic in 1793 and abandoned in 1805; dates were calculated from Sept. 22, 1792
Revolutionary calendar month - a month in the Revolutionary calendar