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]