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:
While October has a stronger finish on average, typically the low for the year happens around Oct. 10-12.
From MarketWatch ● Aug. 19, 2026
“There’s no way to understand Israeli society without understanding the depth of the trauma caused by Oct. 7,” he said.
From The Wall Street Journal ● Jul. 15, 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
Oct. demurred, using as his Excuse my Infirmity and the small Distance to their Shop.
From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume II: The Kingdom on the Waves" by M.T. Anderson
Paramount would have to pay $650 million a quarter to Warner shareholders, or $7 million a day, starting Oct.
From The Wall Street Journal ● Sep. 22, 2026
They’ve now confirmed that they will present those findings on Oct.
From MarketWatch ● Sep. 21, 2026
The candidates have agreed to debate on Oct.
From Los Angeles Times ● Sep. 21, 2026
Settling the suit before it heads to trial could help Paramount avoid racking up costly “ticking fees,” which it offered to win the deal and must begin paying if the deal doesn’t close by Oct.
From The Wall Street Journal ● Sep. 21, 2026
From the notes of Dr. Julian Nye, MD, PsyD: Thurs, Oct 21, third session with Nicole Castro, begun at 8:30pm, at Castro residence.
From "Burning Blue" by Paul Griffin
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.
