oct-

variant of octa- or octo- before a vowel:
octal.

oct.

abbreviation for

octavo.

Oct.

abbreviation for

October.

oct-

combining_form

(used before a vowel) a variant of octo-

Oct

abbreviation for

October

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Example Sentences

The police report offers the most complete picture yet of what occurred at the Monterey hotel on Oct.

From Los Angeles Times

McDonald’s temporarily removed the Quarter Pounder from restaurants in affected states before bringing the menu item back on Oct.

From Salon

The Chargers — who will have a short week after hosting the Tampa Bay Buccaneers on Dec. 15 — won in Denver on Oct.

From Los Angeles Times

After consistently stating that he signed with the Dodgers to win a championship, on Oct.

From Los Angeles Times

In the 2022 fiscal year — which was from Oct.

From Salon

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Words That Use Oct-

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-.

Examples of oct-

One example of a term that features the combining form oct- is octad, “a group or series of eight.” Octad comes from Greek oktás, which uses the equivalent of the form oct-.

The form oct- means “eight,” while the -ad portion of the word is a suffix denoting “a group or unit.” Octad literally translates to “a group of eight.”

What are some words that use the combining form oct-?

octane
octave (using the equivalent form of oct- in Latin)
octennial (using the equivalent form of oct- in Latin)
octet
octillion (using the equivalent form of oct- in French)

What are some other forms that oct- may be commonly confused with?

Break it down!

A duet is a musical composition for two voices or instruments. The du- part of the word means “two.” With this in mind, what is an octet?

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