an act or instance of extending.
the state of being extended.
that by which something is extended; an addition: a four-room extension to a house.
an additional period of time given one to meet an obligation: My term paper wasn't finished so I asked for an extension.
something that can be extended; an extended object: a table with drop-leaf extensions.
range of extending; degree of extensiveness; extent: the extension of our knowledge.
an additional telephone that operates on the principal line.
Commerce. a written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
Physics. that property of a body by which it occupies space.
the act of straightening a limb.
the position that a limb assumes when it is straightened.
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.
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 ).
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.
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.
Manège. the act of bringing or coming into an extended attitude.
of or pertaining to extension courses.

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

extensionality, extensionalism, noun
extensional, adjective
extensionally, adverb
extensionless, adjective
nonextension, noun
nonextensional, adjective
proextension, adjective
superextension, noun

1. stretching, expansion, enlargement, increase, dilation. 3. lengthening, protraction, continuation. 4. delay. 6. limit.

1. contraction.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extension (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
8.  a.  the act of straightening or extending an arm or leg
 b.  its position after being straightened or extended
9.  med See also traction a steady pull applied to a fractured or dislocated arm or leg to restore it to its normal position
10.  a.  a service by which some of the facilities of an educational establishment, library, etc, are offered to outsiders
 b.  (as modifier): a university extension course
11.  logic
 a.  Compare intension 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
 b.  conservative extension a formal theory that includes among its theorems all the theorems of a given theory
[C14: from Late Latin extensiō a stretching out; see extend]

extensional (ɪkˈstɛnʃənəl)
1.  relating to or characterized by extension
2.  logic extensionality substitutivity See also transparent context explicable solely in terms of extensions; ignoring differences of meaning that do not affect the extension

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1400, from L. extensionem/extentionem, noun of action from extendere. In a concrete sense, "extended portion of something" (a railroad, etc.), from 1852. Telephone sense is from 1906
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

extension ex·ten·sion (ĭk-stěn'shən)
Abbr. ext.

  1. The act of straightening or extending a flexed limb.

  2. A pulling or dragging force exerted on a limb in a distal direction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
extension   (ĭk-stěn'shən)  Pronunciation Key 
  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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

extensional definition

Extensional properties, e.g. extensional equality, relate to the "black-box" behaviour of an object, i.e. how its output depends on its input. The opposite is intensional which concerns how the object is implemented.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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