Definition: forward movement
Usage: the ship made little headway against the gale
Similar words: advance, progress, progression
Definition: a movement forward
Usage: he listened for the progress of the troops
Synonyms: clearance, headroom, headway
Definition: vertical space available to allow easy passage under something
Similar words: elbow room, room, way
Definition: space for movement
Usage: room to pass; make way for; hardly enough elbow room to turn around