Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

Thesaurus

extension

noun

Synonyms and Antonyms of extension

1 the act of making longer
  • The board's extension of the school year drew howls of protest.
Synonyms of extension

drawing out, elongation, lengthening, prolongation, prolonging, stretching
Antonyms of extension

abbreviation, abridgment (or abridgement), curtailment, cutback, shortening
2 a smaller structure added to a main building
  • The new extension will connect the house with what is now a freestanding garage.
Synonyms of extension

addition, annex, penthouse
Words Related to extension

arm, ell, wing

Learn More about extension

  1. See words that rhyme with extension Dictionary: Definition of extension Medical Dictionary: Definition of extension Spanish Central: Translation of extension Nglish: Translation of extension for Spanish speakers Britannica English: Translation of extension for Arabic speakers Britannica.com: Encyclopedia article about extension

Seen and Heard

What made you want to look up extension? Please tell us where you read or heard it (including the quote, if possible).

show hide

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

Ask the Editors

Word Games