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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)
Related words. 1  span verb. 2  attention span noun. 3  spick and span adjective.  1. the amount of time that something lasts Nearly 100 witnesses testified over a span of 20 days. attention/concentration span (=the period for which you can pay attention/concentrate): Kids these days have a very limited attention span.