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
“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
“DHS law enforcement lawfully arrested her on Oct. 6.”
From Los Angeles Times ● Jan. 6, 2026
Oct. says only that Others have gone before them, & that it is a considerable Voyage, & that he knows not whether any of them shall reach the Place.
From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume II: The Kingdom on the Waves" by M.T. Anderson
The Centers for Medicare & Medicaid Services will release plan data for 2027 coverage on or around Oct.
From MarketWatch ● Aug. 28, 2026
The annual Medicare open-enrollment period runs from Oct.
From MarketWatch ● Aug. 28, 2026
After months of careful planning, the old East Wing was taken down and construction of a new East Wing began on Oct.
From The Wall Street Journal ● Aug. 21, 2026
Rocha Moya’s term as governor is slated to end Oct.
From Los Angeles Times ● Aug. 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.
