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:
“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
“DHS law enforcement lawfully arrested her on Oct. 6.”
From Los Angeles Times ● Jan. 6, 2026
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
Eastern, cover the Fed’s Oct. 28-29 gathering, where officials lowered rates by a quarter percentage point to a 3.75%–4.00% range and signaled a clear divide over whether additional easing would be appropriate by year-end.
From Barron's ● Nov. 19, 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
Yohanan Plesner, president of the Israel Democracy Institute said harsher prison conditions are a reflection of the pain Israelis felt after Oct.
From The Wall Street Journal ● Jul. 15, 2026
After the state and county submitted a request for the court to temporarily halt the project, a hearing was set for Oct.
From Los Angeles Times ● Jul. 14, 2026
In September, Jay-Z is scheduled to perform stadium concerts in London and Paris ahead of an Oct.
From Los Angeles Times ● Jul. 13, 2026
A professor recounts the experiences of the school’s Jews after the Oct.
From The Wall Street Journal ● Jul. 8, 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.
