This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The volume left at the top of an almost filled jar, tin, or other container before sealing.

n. The space between the top of the contents of a container (such as a jar) and its seal (such as a lid).

n. One's mental state.

n. The gap between the face of the bolt and the stopping surface for the cartridge.

n. the volume left at the top of a filled container (bottle or jar or tin) before sealing

"I would not fire it another time until I had it checked by a competent gunsmith, because that much headspace is a definate safety hazzard to the gun, you, and anyone standing nearby."

indefinite quantity   

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