Span1  —n. 1 full extent from end to end. 2 each part of a bridge between supports. 3 maximum lateral extent of an aeroplane or its wing, or a bird's wing, etc. 4 a maximum distance between the tips of the thumb and little finger. B this as a measure of 9 in. —v. (-nn-) 1 stretch from side to side of; extend across. 2 bridge (a river etc.). [old english]