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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)
Span (engineering) Span is the distance between two intermediate supports for a structure, e.g. a beam or a bridge. A span can be closed by a solid beam or by a rope. Side view of a simply supported beam (top) bending under an evenly distributed load (bottom).