1) Revolutionary calendar month 
Brumaire (bʁymɛʁ) was the second month in the French Republican Calendar. The month was named after the French word brume (fog) which occurs frequently in France at that time of the year. Brumaire was the second month of the autumn quarter (mois d`automne). It started between 22 October and 24 October. It ended between 20 November and 22 Novem....
• (n.) The second month of the calendar adopted by the first French republic. It began thirty days after the autumnal equinox. See Vendemiaire.
Bru`maire' noun [ French, from Latin bruma winter.] The second month of the calendar adopted by the first French republic. It began thirty days after the autumnal equinox. See Vendemiaire . 
Brumaire was the second month in the calendar adopted by the first French Republic. It began on the 23rd of October and ended on the 21st of November. The 18th Brumaire of the year VIII of the French Revolution (November the 9th, 1799) witnessed the overthrow of the Directory by Bonaparte. The next day he dispersed at the point of the bayonet the C...
[n] - second month of the Revolutionary calendar (October and November)
noun second month of the Revolutionary calendar (October and November); the month of mist
(in the French Revolutionary calendar) the second month of the year, extending from October 22 to November 20.