Noun
1. the complete duration of something;
"the job was finished in the span of an hour"2. the distance or interval between two points
3. two items of the same kind
4. a unit of length based on the width of the expanded human hand (usually taken as 9 inches)
5. a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
6. the act of sitting or standing astride