noun (n)

• a mutually agreed delay in the date set for the completion of a job or payment of a debt(noun.time)

  Example:
  They applied for an extension of the loan.
  

  source: wordnet30
• act of expanding in scope; making more widely available(noun.act)

  Example:
  Extension of the program to all in need.
  

  source: wordnet30
• the spreading of something (a belief or practice) into new regions(noun.communication)

  Synonym:
  propagation
  

  source: wordnet30
• an educational opportunity provided by colleges and universities to people who are not enrolled as regular students(noun.act)

  Synonym:
  extension service, university extension
  

  source: wordnet30
• act of stretching or straightening out a flexed limb(noun.act)

  Antonym:
  flexion, flexure
  

  source: wordnet30
• a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename(noun.communication)

  Example:
  Most applications provide extensions for the files they create.
  Most BASIC files use the filename extension .BAS.
  

  Synonym:
  file name extension, filename extension
  

  source: wordnet30
• the most direct or specific meaning of a word or expression; the class of objects that an expression refers to(noun.cognition)

  Example:
  The extension of `satellite of Mars' is the set containing only Demos and Phobos.
  

  Synonym:
  denotation, reference
  

  source: wordnet30
• the ability to raise the working leg high in the air(noun.attribute)

  Example:
  The dancer was praised for her uncanny extension.
  Good extension comes from a combination of training and native ability.
  

  source: wordnet30
• amount or degree or range to which something extends(noun.attribute)

  Example:
  The wire has an extension of 50 feet.
  

  Synonym:
  lengthiness, prolongation
  

  source: wordnet30
• an additional telephone set that is connected to the same telephone line(noun.artifact)

  Synonym:
  extension phone, telephone extension
  

  source: wordnet30
• an addition to the length of something(noun.artifact)

  Synonym:
  elongation
  

  source: wordnet30
• an addition that extends a main building(noun.artifact)

  Synonym:
  annex, annexe, wing
  

  source: wordnet30
• The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.(noun)

  source: webster1913