View synonyms for extension


[ ik-sten-shuhn ]


  1. an act or instance of extending, lengthening, stretching out, or enlarging the scope of something.

    Synonyms: dilation, increase, enlargement, expansion

    Antonyms: contraction

  2. the state of being extended, lengthened, or stretched out.
  3. that by which something is extended or enlarged; an addition:

    a four-room extension to a house.

    Synonyms: continuation, protraction

  4. an additional period of time given one to meet an obligation:

    My term paper wasn't finished so I asked for an extension.

    Synonyms: delay

  5. something that is expandable or can be extended; an extended object:

    a table with drop-leaf extensions.

  6. range or scope of extending; degree of extensiveness; extent:

    the extension of our knowledge.

    Synonyms: limit

  7. an additional telephone that operates on the principal line.
  8. Commerce. a written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
  9. Physics. that property of a body by which it occupies space.
  10. Anatomy.
    1. the act of straightening a limb.
    2. the position that a limb assumes when it is straightened.
  11. Surgery. the act of pulling the broken or dislocated part of a limb in a direction from the trunk, in order to bring the ends of the bone into their natural situation.
  12. Also called extent. Logic. the class of things to which a term is applicable, as “the class of such beings as Plato and Alexander” to which the term “man” is applicable. Compare intension ( def 5 ).
  13. Mathematics. a function having a domain that includes the domain of a given function and that has the same value as the given function at each point in the domain of the given function.
  14. Also called file extension. Computers. one or more characters at the end of a filename, usually following a period, used to indicate the type of file.
  15. Manège. the act of bringing or coming into an extended attitude.


  1. of or relating to extension courses.


/ ɪkˈstɛnʃən /


  1. the act of extending or the condition of being extended
  2. something that can be extended or that extends another object
  3. the length, range, etc, over which something is extended; extent
  4. an additional telephone set connected to the same telephone line as another set or other sets
  5. a room or rooms added to an existing building
  6. a delay, esp one agreed by all parties, in the date originally set for payment of a debt or completion of a contract
  7. the property of matter by which it occupies space; size
    1. the act of straightening or extending an arm or leg
    2. its position after being straightened or extended
  8. med a steady pull applied to a fractured or dislocated arm or leg to restore it to its normal position See also traction
    1. a service by which some of the facilities of an educational establishment, library, etc, are offered to outsiders
    2. ( as modifier )

      a university extension course

  9. logic
    1. the class of entities to which a given word correctly applies: thus, the extension of satellite of Mars is the set containing only Deimos and Phobos Compare intension
    2. a formal theory that includes among its theorems all the theorems of a given theory


/ ĭk-stĕnshən /

  1. Mathematics.
    A set that includes a given and similar set as a subset.
  2. Computer Science.
    A set of characters that follow a filename and are separated from it by a period, used to identify the kind of file.

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Other Words From

  • ex·tension·ali·ty ex·tension·al·ism noun
  • ex·tension·al adjective
  • ex·tension·al·ly adverb
  • ex·tension·less adjective
  • nonex·tension noun
  • nonex·tension·al adjective
  • proex·tension adjective
  • super·ex·tension noun
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Word History and Origins

Origin of extension1

1350–1400; Middle English < Latin extēnsiōn- (stem of extēnsiō ). See extensive, -ion
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Word History and Origins

Origin of extension1

C14: from Late Latin extensiō a stretching out; see extend
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Example Sentences

After all, your fellow employees are an extension of your brand.

If you haven’t already done so, you can let your elected officials know just how important a PSP extension is to you, your families and our economic recovery.

From Fortune

So the ads will be relevant to the web environment you’re currently consuming and consumers will feel more comfortable to convert, as they will see the ads as an extension of the content they are already looking at.

Treat your LinkedIn company page as an extension to your website.

None of the reporters and lawyers looking closely at the deal have presented evidence to show Shapery, and by extension Manchester, intentionally misled the city.

Self-marriage is the ultimate brand extension of a self-obsessed, selfish populus.

Last year, it let an unemployment extension for the long-term jobless expire during the holidays.

But only for the family; inmates cannot be awarded more than $10,000 because of an  extension of the Son of Sam Law.

It is also, by extension, a show about the cultural impact of religion.

What he meant was that he personally, and by extension all Christians, should not be judgmental.

And now let me come to the second problem we opened up in connection with college education—the problem of its extension.

It was the well-known extension en seconde; a favourite trick among Parisian swordsmen of the Romantic school.

And it may safely be said that with its improvement, has arisen also the extension and wide spread practice of music generally.

An octave coupler without such extension is incomplete and is no more honest than a stop which only goes down to Tenor C.

No Briton rejoiced more sincerely than this provincial American in the extension of the Empire.





extensimeterextension agent