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extension ex·ten·sion (ĭk-stěn'shən)n. Abbr. ext.
The act of straightening or extending a flexed limb.
A pulling or dragging force exerted on a limb in a distal direction.
Mathematics A set that includes a given and similar set as a subset.
Computer Science A set of characters that follow a filename and are separated from it by a period, used to identify the kind of file.