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Here are all the possible meanings and translations of the word headroom. Princeton's WordNet(0.00 / 0 votes)Rate this definition: headroom, headway, clearance(noun) vertical space available to allow easy passage under something. headroom, dynamic headroom(noun) the capacity of a system to reproduce loud sounds without distortion. headroom(Noun) the vertical clearance above someone's head, as in a tunnel, doorway etc. headroom(Noun) the ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
Heads up as an adjective means being aware. Heads up as the noun is giving someone new information, making them more aware of the situation. Literally having your head up and your eyes open means you're more aware of your surrounding (contrast with the heads down posture of messing with your phone). So a heads-up display for a pilot helps him keep his eyes open and on the sky instead of down at the controls.