Headspace

The vapor mixture trapped above a solid or liquid in a sealed vessel.

headspace

The distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt. Used as a verb, headspace refers to the interference created between this part of the chamber and the feature of the cartridge that achieves the correct positioning.[21]
Found on http://en.wikipedia.org/wiki/Glossary_of_firearms_terms

Headspace

[firearms] In firearms, headspace is the distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt. Used as a verb, headspace refers to the interference created between this part of the chamber and the feature of the cartridge that achieves the correct positioning...
Found on http://en.wikipedia.org/wiki/Headspace_(firearms)

Headspace

[organisation] headspace is a youth mental health initiative established by the Australian government in 2006. The project is funded by the Department of Health and Ageing under the Youth Mental Health Initiative Program. headspace offers support for those aged 12 to 25 years old on a range of issues including depression, anxiety, stress, a...
Found on http://en.wikipedia.org/wiki/Headspace_(organisation)

headspace

Term for that part of the void in a fermentation tank that serves as a reserve. The container must not be completely filled, because at the fermentation of the grape heated and its volume can increase considerably. The rise space must make up 5 to 10% of the container volume, with a closed one maceration even about 25%. See also below Gäraufsatz,
Found on https://glossary.wein-plus.eu/headspace-1

headspace

The area at the top of a vessel (fermenter, bottle, or keg) which does not contain any liquid. In general, the goal is to minimize headspace, to prevent oxidation of the beer by oxygen in the air. Headspace in the primary fermenter is not a serious concern, because the CO2 produced by fermentation forms a protective blanket on top of the beer, an...
Found on http://hbd.org/uchima/glossary/glossary.html

Headspace

The vapor mixture trapped above a solid or liquid in a sealed vessel.
Found on https://www.encyclo.co.uk/local/20094

headspace

[n] - the volume left at the top of a filled container (bottle or jar or tin) before sealing
Found on http://www.webdictionary.co.uk/definition.php?query=headspace
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