Extension Synonyms

43 extension synonyms include addition, add-on, adjunct, addendum, augmentation, supplement, appendage, appendix, annexe, and wing. Extension is a noun, and its antonyms are retrogression and regression. Here are some additional synonyms for "extension" with example sentences.

Another word for Extension

43 other ways to say extension.

1. addition

  • wing  
  •  
  • supplementary building  
  •  
  • supplement  
  •  
  • ell  
  •  
  • augmentation  
  •  
  • appendix  
  •  
  • appendage  
  •  
  • annexe  
  •  
  • adjunct
  •   
  • addition
  •   
  • addendum
  •   
  • add-on  
  •  

2. expansion

  • widening  
  •  
  • stretching  
  •  
  • lengthening  
  •  
  • increase
  •   
  • heightening  
  •  
  • growth
  •   
  • expansion
  •   
  • enlargement  
  •  
  • enhancement  
  •  
  • elongation  
  •  
  • drawing out  
  •  
  • diversification  
  •  
  • development
  •   
  • deepening  
  •  
  • continuation  
  •  
  • broadening  
  •  
  • augmentation  
  •  
  • amplification  
  •  

3. prolongation

  • protraction  
  •  
  • prolongation  
  •  
  • postponement  
  •  
  • perpetuation  
  •  
  • more/extra time  
  •  
  • longer period  
  •  
  • lengthening  
  •  
  • increased time  
  •  
  • increase
  •   
  • delay  
  •  
  • deferral  
  •  
  • continuation  
  •  
  • additional time  
  •  

Use extension in a Sentence

He installed a browser extension.

She requested an extension politely.

The deadline received an extension.