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5 definitions found
 for extension
From The Collaborative International Dictionary of English v.0.48 :

  Extension \Ex*ten"sion\, n. [L. extensio: cf. F. extension. See
     Extend, v. t.]
     1. The act of extending or the state of being extended; a
        stretching out; enlargement in breadth or continuation of
        length; increase; augmentation; expansion.
        [1913 Webster]
  
     2. (Physics) That property of a body by which it occupies a
        portion of space.
        [1913 Webster]
  
     3. (Logic & Metaph.)
        (a) Capacity of a concept or general term to include a
            greater or smaller number of objects; -- correlative
            of intension.
        (b) the class or set of objects to which a term refers; --
            contrasted with intension, the logical specification
            which defines members of a class, being the set of
            attributes which are necessary and sufficient to
            recognize an object as a member of the class.
            [1913 Webster]
  
                  The law is that the intension of our knowledge
                  is in the inverse ratio of its extension. --Sir
                                                    W. Hamilton.
            [1913 Webster]
  
                  The extension of [the term] plant is greater
                  than that of geranium, because it includes more
                  objects.                          --Abp.
                                                    Thomson.
            [1913 Webster]
  
     4. (Surg.) The operation of stretching a broken bone so as to
        bring the fragments into the same straight line.
        [1913 Webster]
  
     5. (Physiol.) The straightening of a limb, in distinction
        from flexion.
        [1913 Webster]
  
     6. (Com.) A written engagement on the part of a creditor,
        allowing a debtor further time to pay a debt.
        [1913 Webster]
  
     Counter extension. (Surg.) See under Counter.
  
     Extension table, a table so constructed as to be readily
        extended or contracted in length.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  extension
      n 1: a mutually agreed delay in the date set for the completion
           of a job or payment of a debt; "they applied for an
           extension of the loan"
      2: act of expanding in scope; making more widely available;
         "extension of the program to all in need"
      3: the spreading of something (a belief or practice) into new
         regions [syn: propagation, extension]
      4: an educational opportunity provided by colleges and
         universities to people who are not enrolled as regular
         students [syn: extension, extension service, university
         extension]
      5: act of stretching or straightening out a flexed limb [ant:
         flexion, flexure]
      6: a string of characters beginning with a period and followed
         by one or more letters; the optional second part of a PC
         computer filename; "most applications provide extensions for
         the files they create"; "most BASIC files use the filename
         extension .BAS" [syn: extension, filename extension,
         file name extension]
      7: the most direct or specific meaning of a word or expression;
         the class of objects that an expression refers to; "the
         extension of `satellite of Mars' is the set containing only
         Demos and Phobos" [syn: reference, denotation,
         extension]
      8: the ability to raise the working leg high in the air; "the
         dancer was praised for her uncanny extension"; "good
         extension comes from a combination of training and native
         ability"
      9: amount or degree or range to which something extends; "the
         wire has an extension of 50 feet" [syn: extension,
         lengthiness, prolongation]
      10: an additional telephone set that is connected to the same
          telephone line [syn: extension, telephone extension,
          extension phone]
      11: an addition to the length of something [syn: elongation,
          extension]
      12: an addition that extends a main building [syn: annex,
          annexe, extension, wing]

From Moby Thesaurus II by Grady Ward, 1.0 :

  333 Moby Thesaurus words for "extension":
     L, access, accession, accessory, accompaniment, accretion, accrual,
     accruement, accumulation, acreage, addenda, addendum, additament,
     addition, additive, additory, additum, adjunct, adjuvant, advance,
     affective meaning, aggrandizement, alternate, alternative school,
     ambit, ampliation, amplification, amplitude, annex, annexation,
     appanage, appendage, appendant, appendix, appreciation,
     appurtenance, appurtenant, area, arm, ascent, attachment, augment,
     augmentation, ballooning, bearing, bigness, blab school, bloating,
     block, boarding school, body, boom, boost, breadth, broadening,
     buildup, bulk, caliber, call box, capacity, central school, coda,
     coin telephone, coloring, coming after, compass, complement,
     comprehensiveness, concomitant, connotation, consecution,
     consecutiveness, consequence, consolidated school, continualness,
     continuance, continuation, continuation school, continuing,
     continuity, continuum, corollary, correspondence school,
     country day school, coverage, crescendo, dame school, day school,
     denotation, deployment, depth, descent, desk telephone,
     development, dial telephone, diameter, dimension, dimensions,
     dispersion, distance, distension, drawing out, drift, edema,
     effect, elevation, ell, elongation, emptiness, empty space,
     endurance, enlargement, essence, evening school, expanse,
     expansion, extensiveness, extent, extrapolation, fanning out,
     field, finishing school, fixture, flare, flood, following, force,
     free school, gain, galactic space, gauge, girth, gist,
     grammatical meaning, greatening, greatness, growth, gush, height,
     hike, hiking, idea, impact, implication, import, increase,
     increment, infinite space, infinity, inflation, informal school,
     intension, interstellar space, jump, largeness, leap, length,
     lengthening, lengthiness, lexical meaning, line, lineage,
     linear measures, lingering, literal meaning, logical sequence,
     long time, longitude, longness, magnification, magnitude,
     maintenance, mass, meaning, measure, measurement, mileage,
     mounting, mouthpiece, multiplication, night school,
     nongraded school, nothingness, offshoot, open classroom school,
     orbit, order, order of succession, outer space, overall length,
     overtone, pay station, pendant, pensionat, perpetuation,
     perpetuity, perseverance, persistence, pertinence, phone, pith,
     platoon school, point, posteriority, postposition,
     practical consequence, private school, procession, procrastination,
     production, productiveness, progress, progression,
     progressive school, proliferation, prolongation, proportion,
     proportions, protraction, public school, public telephone, purport,
     pursuance, purview, push-button telephone, radius, raise, raising,
     range, range of meaning, reach, real meaning, receiver, reference,
     referent, reinforcement, relation, relevance, repetition, rise,
     rotation, run, scale, school without walls, scope,
     semantic cluster, semantic field, sense, sequence, series,
     side effect, side issue, significance, signification, significatum,
     signifie, size, snowballing, space, span, span of meaning,
     spatial extension, special school, sphere, spirit, splay, spread,
     spreading, spreading out, staying power, storefront school,
     straight course, strain, street academy, stretch, stretching,
     stringing out, structural meaning, subjunction, substance,
     succession, successiveness, suffixation, sum, sum and substance,
     summer school, superficial extension, supplement, surface, surge,
     sustained action, sustenance, sweep, swelling, symbolic meaning,
     tailpiece, telephone, telephone booth, telephone engineering,
     telephone extension, telephone mechanics, telephone receiver,
     telephonics, telephony, tenor, tension, totality of associations,
     tract, transferred meaning, transmitter, tumescence,
     unadorned meaning, undergirding, undertone, uninterrupted course,
     union school, unremittingness, up, upping, upsurge, upswing,
     uptrend, upturn, vacation school, value, volume, wall telephone,
     waxing, way, widening, width, wing, yardage
  
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  extension
  
     1.  filename extension.
  
     2.  A feature or piece of code which
     extends a program's functionality, e.g. a plug-in.
  
     (1997-06-21)
  

From Bouvier's Law Dictionary, Revised 6th Ed (1856) :

  EXTENSION, comm. law. This term is applied among merchants to signify an 
  agreement made between a debtor and his creditors, by which the latter, in 
  order to enable the former, embarrassed in his circumstances, to retrieve 
  his standing, agree to wait for a definite length of time after their 
  several claims should become due and payable, before they will demand 
  payment. 
       2. Among the French, a similar agreement is known by the name of 
  atermoiement. Merl. Rep. mot Atermoiement. 
  
  

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