Headspace meaning

hĕdspās
The volume left at the top of an almost filled jar, tin, or other container before sealing.
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The space between the top of the contents of a container (such as a jar) and its seal (such as a lid).
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(informal) One's mental state.
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(firearms) The gap between the face of the bolt and the stopping surface for the cartridge.
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Origin of headspace