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:
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
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 10-year Treasury yield rose by a total of 11.2 basis points on Oct. 29-30, and advanced by a total of 7.9 basis points on Sept. 17-18.
From MarketWatch ● Dec. 11, 2025
“But that’s actually a positive development for the sustainability of the current bull market, which began on Oct. 12, 2022.”
From Barron's ● Nov. 24, 2025
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
Senate, governor and attorney general — suggest lots of room for movement in the less than 12 weeks remaining until Oct.
From Salon ● Jul. 29, 2026
They shared what is thought to be their first public kiss Oct.
From Los Angeles Times ● Jul. 28, 2026
Your payment date depends on your birth date, so your first payment will generally arrive the month after your first month of entitlement, regardless of whether your birthday is on, say, Oct.
From MarketWatch ● Jul. 28, 2026
“H Mart: The Cookbook” will be published Oct.
From Salon ● Jul. 23, 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.
