- extension
- ex•ten•sion[[t]ɪkˈstɛn ʃən[/t]] n.1) an act or instance of extending2) the state of being extended3) that by which something is extended; an addition:a four-room extension to a house[/ex]4) an enlargement in scope or degree:an extension of knowledge[/ex]5) the total range of something; compass6) an increase in length of time given one to meet an obligation, as the repayment of a debt7) phs the property of a body by which it occupies space8) anat.a) the act of straightening a limbb) the position that a limb assumes when it is straightened9) tgp an additional telephone that operates on a principal line10) a program by which an institution, as a university, provides instruction or other services away from the regular location or outside regular hours11) pho logic the class of things to which a term is applicable; denotationCompare intension 5)12) cmpAlso called file extension. one or more characters at the end of a filename, usu. following a period, used to indicate the type of file.•Etymology: 1350–1400; < L extēnsiō span ex•ten′sion•al, adj. ex•ten′sion•al•ly, adv. ex•ten′sion•less, adj.
From formal English to slang. 2014.