oct-

¹

1. variant of octa- or octo- before a vowel.

   octal.

oct.

²

abbreviation

1. octavo.

Oct.

³

abbreviation

1. October.

Oct

¹

abbreviation

1. October

oct-

²

combining form

1. (used before a vowel) a variant of octo-

Example Sentences

Despite November’s sharp pullback, the S&P 500 is still up 12.3% this year and just 4.2% below its record closing high booked as recently as Oct.

Read more on MarketWatch

A second man — Gabriel Garcia-Aviles, 56, who lived near Costa Mesa — died Oct.

Read more on Los Angeles Times

ICE said Garcia-Aviles was arrested Oct.

Read more on Los Angeles Times

Even with Friday’s moves, the Dow and the S&P 500 still logged their worst week since Oct.

Read more on MarketWatch

Even with Friday’s moves, the Dow and the S&P 500 still logged their worst week since Oct.

Read more on MarketWatch

When To Use

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-.