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:
“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
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
At their policy meeting on Oct. 28-29, as repo-market volatility spiked, Fed officials debated making an adjustment to the plumbing that steers funds through the SRF, according to the notes from the meeting published Wednesday.
From The Wall Street Journal ● Nov. 24, 2025
A sentence on the back advised: Plan to see Vermont’s fall foliage between Sept. 25 and Oct. 15th when it is at its vivid best.
From "The Secret History" by Donna Tartt
Mr. Montefiore explains this as a consequence of Oct.
From The Wall Street Journal ● Jul. 31, 2026
Early this year, Paramount agreed to pay Warner investors a so-called ticking fee of $.25 per share per quarter, beginning Oct.
From Los Angeles Times ● Jul. 31, 2026
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
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.
