Definitions for Extensionɪkˈstɛn ʃən

Random House Webster's College Dictionary

ex•ten•sionɪkˈstɛn ʃən(n.)

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 enlargement in scope or degree:
an extension of knowledge.
the total range of something; compass.
an increase in length of time given one to meet an obligation, as the repayment of a debt.
the property of a body by which it occupies space.
Category: Physics
the act of straightening a limb. the position that a limb assumes when it is straightened.
Category: Anatomy
an additional telephone that operates on a principal line.
Category: Telegraphy and Telephony
a program by which an institution, as a university, provides instruction or other services away from the regular location or outside regular hours.
Logic. the class of things to which a term is applicable; denotation.
Category: Philosphy
Ref: Compare intension (def. 5) 5 .
Computers.
Category: Computers

Origin of extension:

1350–1400; < L extēnsiō span

ex•ten′sion•less(adj.)

Princeton's WordNet

extension(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"
extension(noun)
act of expanding in scope; making more widely available
"extension of the program to all in need"
propagation, extension(noun)
the spreading of something (a belief or practice) into new regions
extension, extension service, university extension(noun)
an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
extension(noun)
act of stretching or straightening out a flexed limb
extension, filename extension, file name extension(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
"most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS"
reference, denotation, extension(noun)
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"
extension(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"
extension, lengthiness, prolongation(noun)
amount or degree or range to which something extends
"the wire has an extension of 50 feet"
extension, telephone extension, extension phone(noun)
an additional telephone set that is connected to the same telephone line
elongation, extension(noun)
an addition to the length of something
annex, annexe, extension, wing(noun)
an addition that extends a main building

Kernerman English Learner's Dictionary

extension(noun)ɪkˈstɛn ʃən
extra time added to sth
an extension on the project deadline; research dealing with the extension of life
extensionɪkˈstɛn ʃən
a telephone line in a building where there are many lines
My office number is 555 1001, extension 345.
extensionɪkˈstɛn ʃən
a part added to a building later; = addition
They built an extension on their house.
extensionɪkˈstɛn ʃən
sth that develops naturally from sth else
We see the newsletter as an extension of our website.
extensionɪkˈstɛn ʃən
the three letters after the dot in a computer file name
files with an exe extension

Wiktionary

extension(Noun)
The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.
extension(Noun)
That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension")
extension(Noun)
Capacity of a concept or general term to include a greater or smaller number of objects; -- correlative of intension.
extension(Noun)
A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
extension(Noun)
The operation of stretching a broken bone so as to bring the fragments into the same straight line.
extension(Noun)
An exercise in which an arm or leg is straightened against resistance.
extension(Noun)
A simple offensive action, consisting of extending the weapon arm forward.
extension(Noun)
A numerical code used to specify a specific telephone in a telecommunication network.
extension(Noun)
A file extension.
Files with the .txt extension usually contain text.

Webster Dictionary

Extension(verb)
the act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion
Extension(verb)
that property of a body by which it occupies a portion of space
Extension(verb)
capacity of a concept or general term to include a greater or smaller number of objects; -- correlative of intension
Extension(verb)
the operation of stretching a broken bone so as to bring the fragments into the same straight line
Extension(verb)
the straightening of a limb, in distinction from flexion
Extension(verb)
a written engagement on the part of a creditor, allowing a debtor further time to pay a debt