oct-
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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
Many were already torn over the war, traumatized by Oct. 7th and staggered by an unfamiliar blast of antisemitism in what has long been a haven.
From The Wall Street Journal ● Jun. 8, 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
A seven-day film festival stretching Oct. 10-20 in Beverly Hills celebrates the legacy of HandMade Films, the English company ex-Beatle George Harrison created initially to help his pals in Monty Python’s Flying Circus.
From Los Angeles Times ● Mar. 23, 2026
Then said I, He did not wake from his Slumber, & Oct. saith that he knew that as well.
From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume II: The Kingdom on the Waves" by M.T. Anderson
The company will begin taking orders for the shares on Oct.
From The Wall Street Journal ● Sep. 18, 2026
The two sides will convene for two days, Oct.
From Los Angeles Times ● Sep. 16, 2026
The plans will be available for selection during the Medicare Advantage open-enrollment period, which begins Oct.
From MarketWatch ● Sep. 16, 2026
Friedman was, as usual, channeling mainstream foreign policy dogma, which briefly held that constructive change might emerge from the chaotic aftermath of the Oct.
From Salon ● Sep. 14, 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.
