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Definition of span. 1  1 : the distance from the end of the thumb to the end of the little finger of a spread hand; also : an English unit of length equal to nine inches (22.9 centimeters)
WAN. Stands for Wide Area Network.. It is similar to a Local Area Network (LAN), but it's a lot bigger. Unlike LANs, WANs are not limited to a single location.Many wide area networks span long distances via telephone lines, fiber optic cables, or satellite links.AN. Stands for Wide Area Network.. It is similar to a Local Area Network (LAN), but it's a lot bigger. Unlike LANs, WANs are not limited to a single location.