oct-
oct-
1 American
oct.
2
American
abbreviation
Oct.
3
American
abbreviation
Oct
1
British
abbreviation
oct-
2
British
combining form
Usage
What does oct- mean? Oct- is a combining form used like a prefix meaning “eight.” It is used in a great many scientific and technical terms. Octo- comes from the Greek oktṓ, meaning “eight.” The Latin equivalent, which is almost identical in spelling and pronunciation, is octō. What are variants of oct-?Oct- is a variant of octa- or octo-, which loses its -a- or -o- when combined with words or word elements beginning with vowels. Want to know more? Check out our Words That Use entries for both octa- and octo-.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
“We inform these voters that our procedures have not changed because the law has not changed and that we will mail their 2026 General Election ballots by Oct. 5.”
From Los Angeles Times ● Jul. 2, 2026
“Crypto sentiment has broadly weakened since Oct. 10, 2025, and the market is currently operating in a low-liquidity environment with limited new catalysts,” said Paul Howard, senior director at crypto trading firm Wincent.
From Barron's ● May 28, 2026
That comes after a series of atmospheric river storms resulted in downtown Los Angeles’ wettest start to the water year, which begins Oct. 1., since 2011.
From Los Angeles Times ● Jan. 22, 2026
“The one-year growth in U.S.-based ETF holdings have slowed down from 441K BTC on Oct. 10, to 271K BTC today, indicating slower demand from U.S. investors,” Julio Moreno, CryptoQuant’s head of research, told MarketWatch.
From MarketWatch ● Nov. 17, 2025
Oct. will not reply, but informs me that it is a hidden Place, & that when he leaves me—mark this!—leaves me—he shall fly to them.
From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume II: The Kingdom on the Waves" by M.T. Anderson
Join the most influential voices across government, industry, venture capital and public health on Oct.
From The Wall Street Journal ● Jul. 10, 2026
A professor recounts the experiences of the school’s Jews after the Oct.
From The Wall Street Journal ● Jul. 8, 2026
If that move holds, shares will notch their largest daily percentage gain since Oct.
From Barron's ● Jun. 29, 2026
They also must agree on the cost of those services by Oct.
From Los Angeles Times ● Jun. 27, 2026
Crash landing in field Damask, near Ormaie, 1I Oct.
From "Code Name Verity" by Elizabeth Wein
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
