Definitions

extension

[ik-sten-shuhn] / ɪkˈstɛn ʃən /

NOUN

enlargement, continuation

Synonyms

STRONGEST

delay development expansion increase postponement

STRONG

addendum addition adjunct amplification annex appendage appendix arm augmentation branch broadening compass dilatation distension elongation extent lengthening orbit production prolongation protraction purview radius reach scope span spread stretch stretching supplement sweep widening wing

WEAK

continuing drawing out spreading out

Antonyms

STRONGEST

decrease

STRONG

base body lessening shortening subtraction

WEAK

abbreviation abridgment compression contraction curtailment reduction

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.

The inspector ordered her to cease using the building as a dwelling, remove the unauthorised structure and demolish the "unlawful extension" to the barn.

From BBC • Jun. 11, 2026

DCC said it agreed to an extension of the deadline for the consortium to make a formal offer for the company or walk away until July 8 so that the companies can continue talks.

From The Wall Street Journal • Jun. 10, 2026

Counties can ask for an extension, and they still have up to 30 days to certify the results, so the law only goes so far.

From Salon • Jun. 9, 2026

But filing an extension did not extend your due date for paying taxes.

From MarketWatch • Jun. 8, 2026

Dad was in the extension, which I had begun to jokingly call the Chapel.

From "Educated" by Tara Westover

Vocabulary lists containing extension

The SAT: Multiple-Meaning Words, List 6

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The ACT Reading Test: Multiple-Meaning Words, List 2

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The New SAT: Multiple-Meaning Words

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!