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:
“I have older customers who have removed mezuzas from their front doors since Oct. 7 out of fear,” he says.
From The Wall Street Journal ● Nov. 5, 2026
The poll of 2,787 registered California voters was conducted online in English and Spanish Oct. 19-25 and has a margin of error of about 3 percentage points in either direction.
From Los Angeles Times ● Oct. 29, 2026
It is fair to say not everyone saw Oct. 7’s events in New York the same way.
From Slate ● Oct. 15, 2026
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
Oct. will not reply, but informs me that it is a hidden Place, & that when he leaves me—mark this!—leaves me—he shall fly to them.
From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume II: The Kingdom on the Waves" by M.T. Anderson
U.S. cottage-cheese sales rose 17.7% to around $2.32 billion for the 52-week period that ended Oct.
From MarketWatch ● Nov. 7, 2026
It was the second time Doncic has scored 50 points or more this season, his first time coming when he scored 52 points against the Utah Jazz on Oct.
From Los Angeles Times ● Nov. 7, 2026
Fans across the globe flocked to midnight release parties for “A Court of Splintered Harmony,” with over 900 fans alone in New York City flocking to Barnes and Noble on Oct.
From MarketWatch ● Nov. 6, 2026
The 6,500 figure, which was current as of Oct.
From Los Angeles Times ● Nov. 6, 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
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
