- the act of straightening a limb.
- the position that a limb assumes when it is straightened.
- extension agent,
- extension bolt,
- extension cord,
- extension courses,
- extension field
Origin of extension
- the act of straightening or extending an arm or leg
- its position after being straightened or extended
- a service by which some of the facilities of an educational establishment, library, etc, are offered to outsiders
- (as modifier)a university extension course
- the class of entities to which a given word correctly applies: thus, the extension of satellite of Mars is the set containing only Deimos and PhobosCompare intension (def. 1a)
- conservative extension a formal theory that includes among its theorems all the theorems of a given theory
Word Origin for extension
c.1400, from Old French extension (14c.) and directly from Latin extensionem/extentionem (nominative extensio/extentio), noun of action from past participle stem of extendere (see extend). In a concrete sense, "extended portion of something" (a railroad, etc.), from 1852. Telephone sense is from 1906.