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1a part that is added to something to enlarge or prolong it; a continuation:the railroad’s southern extension a room or set of rooms added to an existing building. the action or process of becoming or making something larger:the extension of the president’s powers an application of an existing system or activity to a new area:direct marketing is an extension of telephone selling an increase in the length of time given to someone to hold office, complete a project, or fulfill an obligation. Computing an optional suffix to a file name, typically consisting of a period followed by several characters, indicating the file’s content or function. 2 (also extension cord) a length of electric cord that permits the use of an appliance at some distance from a fixed socket. an extra telephone on the same line as the main one. a subsidiary telephone in a set of offices or similar building, on a line leading from the main switchboard but having its own additional number. 3 [usually as modifier] instruction by a university or college for students who do not attend full time:extension courses 4
) lengths of real or artificial hair woven into a person’s own hair to create a long hairstyle.
5the action of moving a limb from a bent to a straight position:seizures with sudden rigid extension of the limbs the muscle action controlling this:triceps extension Ballet the ability of a dancer to raise one leg above the waist, or an instance of this:she has amazing extension he could perform 180-degree extensions Medicine the application of traction to a fractured or dislocated limb or to an injured or diseased spinal column to restore it to its normal position. the lengthening of a horse’s stride within a particular gait. 6 Logic the range of a term or concept as measured by the objects that it denotes or contains, as opposed to its internal content. Often contrasted with intension. Physics
& Philosophy the property of occupying space; spatial magnitude:nature, for Descartes, was pure extension in space