• WordNet 3.6
    • n Vendemiaire first month of the Revolutionary calendar (September and October); the month of the grape harvest
    • ***
Webster's Revised Unabridged Dictionary
    • n Vendémiaire The first month of the French republican calendar, dating from September 22, 1792.☞ This calendar was substituted for the ordinary calendar, dating from the Christian era, by a decree of the National Convention in 1793. The 22d of September, 1792, which had been fixed upon as the day of the foundation of the republic, was also the date of the new calendar. In this calendar, the year, which began at midnight of the day of the autumnal equinox, was divided into twelve months of thirty days, with five additional days for festivals, and every fourth year six. Each month was divided into three decades of ten days each, the week being abolished. The names of the months in their order were, Vendémiaire Brumaire Frimaire Nivose Pluviose Ventose Germinal Floréal Prairial Messidor Thermidorsometimes called Fervidor), and Fructidor. This calendar was abolished December 31, 1805, and the ordinary one restored January 1, 1806.
    • ***
Chambers's Twentieth Century Dictionary
    • n Vendemiaire vong-dā-mi-ār′ the first month in the French Revolutionary Calendar, from 22d September to 21st October.
    • ***


Webster's Revised Unabridged Dictionary
F., fr. L. vindemia, vintage
Chambers's Twentieth Century Dictionary
'The vintage-month,' Fr.,—L. vindemia, vintage—vinum, wine, demĕre, to take off—de, off, emĕre, to take.


In literature:

BARRAS, Paul-Francois, in National Convention, commands in Thermidor, appoints Napoleon in Vendemiaire.
"The French Revolution" by Thomas Carlyle
We had a fight there last Vendemiaire with the Gars and his brigands.
"The Chouans" by Honore de Balzac
Even his fellow-regicides, even the authors of the slaughter of Vendemiaire and of the arrests of Fructidor, were ashamed of him.
"The Miscellaneous Writings and Speeches of Lord Macaulay, Vol. 2 (of 4)" by Thomas Babington Macaulay
So, that after Vendemiaire 13, it looks as if the Jacobin band had made the conquest of France a second time.
"The Origins of Contemporary France, Volume 4 (of 6)" by Hippolyte A. Taine
He signed Buonaparte even after the famous 13th Vendemiaire.
"Memoirs of Napoleon Bonaparte, Complete" by Louis Antoine Fauvelet de Bourrienne
I shall be in charge during this coming Vendemiaire.
"I Will Repay" by Baroness Emmuska Orczy
Bourg, 23d Vendemiaire of the year IX.
"The Companions of Jehu" by Alexandre Dumas, père
But I will not conceal from you that your letters of the 2d and 3d Vendemiaire, just received, surprised me much.
"A Compilation of the Messages and Papers of the Presidents" by Edited by James D. Richardson
VENDEMIAIRE (vintage month), the first month of the French Revolution year, from 22nd September to 21st October.
"The Nuttall Encyclopaedia" by Edited by Rev. James Wood
Such was the constitution which was proclaimed on September 22nd, 1795, or 1st Vendemiaire, Year IV., of the revolutionary calendar.
"The Life of Napoleon I (Volumes, 1 and 2)" by John Holland Rose
On the 4th of October, 12th of Vendemiaire, the sections of Paris called out their national guard.
"The French Revolution" by R. M. Johnston
He has his own policy, his own 13th Vendemiaire, his own 18th Brumaire.
"Napoleon the Little" by Victor Hugo
Lord God, Monsieur Combalot, what ever is this pair of over-shoes down for the 8 Vendemiaire?
"The Gods are Athirst" by Anatole France
This constitution is known as that of I Vendemiaire, An IV, or September twenty-second, 1795.
"The Life of Napoleon Bonaparte" by William Milligan Sloane
Even his fellow regicides, even the authors of the slaughter of Vendemiaire and of the arrests of Fructidor, were ashamed of him.
"Critical and Historical Essays, Volume III (of 3)" by Thomas Babington Macaulay
Eloge funebre des generaux Kleber et Desaix, prononce le 1er vendemiaire an IX a la Place des Victoires.
"The Life of Napoleon Bonaparte" by William Milligan Sloane
It is the 13th Vendemiaire, year III, or October 15, 1795.
"Napoleon's Young Neighbor" by Helen Leah Reed
He manoeuvred among the parties as on the 13th Vendemiaire.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 7" by Various