1 bridge, link, stretch, overpass, Chiefly Brit flyover:
We drove across the entire span in less than five minutes.
2 course, extent, interval, stretch, period, time, term, spell:
In the short span of six hours we had crossed the Atlantic.
3 cross, stretch over, reach over, extend over, go over, bridge:
A rude bridge spans the river at Lexington. Their lives spanned more than a century.