span in WordNet English dictionary

1. two items of the same kind
   couple  pair  twosome  twain  brace  span  yoke  couplet  distich  duo  duet  dyad  duad 
   
2. a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
   bridge  span 
   
3. the act of sitting or standing astride
   straddle  span 
   
4. the distance or interval between two points
   span 
   
5. a unit of length based on the width of the expanded human hand (usually taken as 9 inches)
   span 
   
6. the complete duration of something
   "the job was finished in the span of an hour"
   span 
   

1. to cover or extend over an area or time period
   "Rivers traverse the valley floor", "The parking lot spans 3 acres"; "The novel spans three centuries"
   cross  traverse  span  sweep