c.1050, from L. October (mensis), from octo "eight," from PIE base *octo(u)- "eight." For -ber see December. Replaced O.E. winterfylleð. In Rus. history, October Revolution (in which the Bolsheviks overthrew the Provisional Government) happened Nov. 7, but because Russia
had not at that time adpoted the Gregorian calendar reform, this date was reckoned there (Old Style) as Oct. 25. Octobrist can have two senses: the first (from Rus. oktyabrist) is a member of the league formed October 1905 in response to imperial policies; the second (from Rus. Oktyabryonok) is a member of a Rus. communist children's organization, founded 1925 and named in honor of the October Revolution.