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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)
From Wikipedia, the free encyclopedia. In linear algebra, the linear span (also called the linear hull or just span) of a set of vectors in a vector space is the intersection of all subspaces containing that set. The linear span of a set of vectors is therefore a vector space. Spans can be generalized to matroids and modules. 1 Definition.