extension Meaning, Definition & Usage

  1. noun 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. noun act of expanding in scope; making more widely available
    • extension of the program to all in need
  3. noun the spreading of something (a belief or practice) into new regions
    propagation.
  4. noun an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
    university extension; extension service.
  5. noun act of stretching or straightening out a flexed limb
  6. noun a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
    file name extension; filename extension.
    • most applications provide extensions for the files they create
    • most BASIC files use the filename extension .BAS
  7. noun the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
    denotation; reference.
    • the extension of `satellite of Mars' is the set containing only Demos and Phobos
  8. noun 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. noun amount or degree or range to which something extends
    lengthiness; prolongation.
    • the wire has an extension of 50 feet
  10. noun an additional telephone set that is connected to the same telephone line
    telephone extension; extension phone.
  11. noun an addition to the length of something
    elongation.
  12. noun an addition that extends a main building
    wing; annexe; annex.

WordNet

Ex*ten"sion noun
Etymology
L. extensio: cf. F. extension. See Extend, v. t.
Definitions
  1. The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.
  2. (Physics) That property of a body by which it occupies a portion of space.
  3. (Logic & Metaph.) Capacity of a concept or general term to include a greater or smaller number of objects; -- correlative of intension.
    The law is that the intension of our knowledge is in the inverse ratio of its extension. Sir W. Hamilton.
    The extension of [the term] plant is greater than that of geranium, because it includes more objects. Abp. Thomson.
  4. (Surg.) The operation of stretching a broken bone so as to bring the fragments into the same straight line.
  5. (Physiol.) The straightening of a limb, in distinction from flexion.
  6. (Com.) A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.

Webster 1913