(rail transport) Having only a single track so that trains may only run in one direction at a time

(travel) A ticket entitling the holder to travel in one direction to a destination.

plural of single crystal

Designed to be used one time and then discarded or disposed of.

A variety of Gloucester cheese, less strong-tasting than double Gloucester.

plural of single Gloucester

plural of single eyelid

An upper eyelid that has no noticeable fold when the eye is open; typical of East Asian eyes.

plural of single combat

(historical) A duel between single representatives of opposing armies, with the outcome accepted as the battle's outcome.