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.

Anatomy .

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.

noun

abbreviation , abridgment , compression , contraction , curtailment , decrease , reduction , shortening

noun

addendum , addition , adjunct , amplification , annex , appendage , appendix , arm , augmentation , branch , broadening , compass , continuing , delay , development , dilatation , distension , drawing out , elongation , expansion , extent , increase , lengthening , orbit , postponement , production , prolongation , protraction , purview , radius , reach , scope , span , spread , spreading out , stretch , stretching , supplement , sweep , widening , wing , enlargement , ambit , realm , sphere , swing , area , duration , outgrowth , projection , reprieve , stay