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:
The findings were presented at the American Academy of Pediatrics 2026 National Conference & Exhibition Oct. 2-6, 2026, at the San Diego Convention Center.
From Science Daily ● Oct. 6, 2026
While October has a stronger finish on average, typically the low for the year happens around Oct. 10-12.
From MarketWatch ● Aug. 19, 2026
The state water board is accepting comments on the plan until Sept. 18 and will consider whether to adopt the plan at a hearing on Oct. 28-29.
From Los Angeles Times ● Aug. 19, 2026
“Over 100 years of history suggest that the odds of a bull market will improve after Oct. 30th of this year,” Kaeppel wrote.
From MarketWatch ● Aug. 11, 2026
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
Market participants are focused on U.S. consumer price inflation data for September due Wednesday as a key input ahead of the Federal Reserve’s next interest-rate decision on Oct.
From The Wall Street Journal ● Oct. 13, 2026
Medicare Advantage plans with higher ratings get extra payments and can be used by older adults to shop for their health coverage during Medicare’s open-enrollment season, which begins Oct.
From MarketWatch ● Oct. 13, 2026
The documentary ‘Asco: Without Permission’ premieres on PBS on Oct.
From Los Angeles Times ● Oct. 13, 2026
Brazil’s next round of voting for the presidential election will take place on Oct.
From MarketWatch ● Oct. 12, 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.
