Synonyms of extension in English:

extension

noun

  • 1 they are planning a new extension
    addition, adjunct, annex, wing, supplementary building, ell, add-on, bump-out
  • 2 an extension of knowledge
    expansion, increase, enlargement, widening, broadening, deepening; augmentation, enhancement, development, growth, continuation
  • 3 an extension of opening hours
    prolongation, lengthening, increase
  • 4 I need an extension on my essay
    postponement, more/extra time, deferral, delay
  • Definition of extension in:

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