An open passage through a wood; a grassy open or cleared space in a forest.
An everglade.
An open space in the ice on a river or lake.
A bright surface of ice or snow.
The vertical clearance above someone's head, as in a tunnel, doorway etc.
The ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
The vertical measurement, top to bottom, for example for clearance under a bridge.
The distance between the actual performance of an algorithm and its maximum possible performance.