Définitions
1.NounThe vertical clearance above someone's head, as in a tunnel, doorway etc; room (space) for one's head.
2.NounThe vertical measurement, top to bottom, for example for clearance under a bridge.
3.NounThe ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
4.NounThe distance between the actual performance of an algorithm and its maximum possible performance.
5.NounSynonym of headspace (“space between the top of the contents of a container and its seal”).