Oct

oct-

variant of octa- or octo- before a vowel: octal.
Dictionary.com Unabridged

Oct.

oct.

October

[ok-toh-ber]
noun
1.
the tenth month of the year, containing 31 days. Abbreviation: Oct.
2.
British. ale or beer traditionally brewed in this month.

Origin:
before 1050; Middle English, Old English < Latin Octōber the eighth month of the early Roman year, equivalent to octō- octo- + -ber, on the model of September, November, December; see December

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Oct
 
abbreviation for
October

oct-
 
combining form
(used before a vowel) a variant of octo-

October (ɒkˈtəʊbə)
 
n
the tenth month of the year, consisting of 31 days
 
[Old English, from Latin, from octo eight, since it was the eighth month in Roman reckoning]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

October
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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
OCT
Octans (constellation)
oct.
octavo
Oct.
October
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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