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1. The act of extending or the condition of being extended: the extension of the subway into the suburbs.
2. The amount, degree, or range to which something extends or can extend: The wire has an extension of 50 feet.
a. The act of straightening or extending a limb.
b. The position assumed by an extended limb.
4. A length of human or synthetic hair attached to the scalp or to strands of hair close to the scalp to add volume, length, or color.
5. Medicine The application of traction to a fractured or dislocated limb to restore the normal position.
a. An addition that increases the area, influence, operation, or contents of something: an extension for the vacuum cleaner; built a new extension onto the hospital wing.
b. An additional telephone connected to a main line.
a. An allowance of extra time, as for the repayment of a debt.
b. The period of this extra time: three months' extension on the loan.
8. The property of an object by which it occupies space.
a. A program in a university, college, or school offering academic instruction to nontraditional students, such as working adults, who cannot attend classes at the usual place and time.
b. A publicly funded program offering such instruction along with information on agriculture, home economics, and business.
10. Computers A set of characters that follow a filename and are separated from it by a period, used to identify the kind of file: In most operating systems, filenames having the extension .EXE are executable files.
11. Logic The class of objects designated by a specific term or concept; denotation.
12. Mathematics A set that includes a given and similar set as a subset.

[Middle English extensioun, from Old French extension, from Latin extēnsiō, extēnsiōn-, from extēnsus, past participle of extendere, to extend; see extend.]

ex·ten′sion·al adj.


1. (Logic) relating to or characterized by extension
2. (Logic) logic explicable solely in terms of extensions; ignoring differences of meaning that do not affect the extension. See also extensionality, substitutivity, transparent context
exˈtensionally adv
exˈtensionalism n
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.extensional - defining a word by listing the class of entities to which the word correctly applies
logic - the branch of philosophy that analyzes inference
denotative, denotive - having the power of explicitly denoting or designating or naming
References in periodicals archive ?
Extensional Paramodulation for Higher-Order Logic and Its Effective Implementation Leo-III
One of the first tasks at CNGP is drilling and Pantoro expected extensional and infill programs to start at initial focus areas by the end of this month.
Early extensional basins were filled by a continental sedimentary sequence (Palmas formation), which yielded U/Pb age peaks at 66 and 56 Ma from detrital zircons and a maximum depositional age of ~43 Ma.
The extensional crystallization of Bisyka rubber is said to equal that of natural rubber.
In this study, we have investigated the effects of mixing time, screw speed and content of disentangled UHMWPE on the linear viscoelastic and non-linear extensional rheology of the HDPE/disentangled UHMWPE blends.
Tenders are invited for The dock - interior and extensional
It has completed an infill and extensional drilling programme at Bagassi South, which resulted in a significant grade increase of approximately 37% in the Mineral Resource Estimate (MRE).
of practical philosophy, (extensional philosophy) Rational judgments of
According to the plate characteristics and the classification of sedimentary basins [21], the oil shale-bearing basins in China can be divided into four types: extensional basins, flexural basins, intra-plate basins and strike-slip basins.
Ahora bien, ?es posible que haya una teoria del significado extensional para L que, no obstante, evite los problemas a los teoremas tipo [b]?
Continental rift basins are widespread extensional structures on the Earth's surface and are known from the Archean up to the present.