headspacenoun/ˈhɛdspeɪs/

• 1

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

  • Control of headspace is important for economic and technical reasons. Underfilling will contravene Weights and Measures legislation and may cause rusting in the headspace […]
• 2

  informalOne's capacity for mental activity modeled as a physical space with limits.

  • Meronym: mindshare
  • It's like, I need to clear my headspace but I can't do that with him around because he's just ego, you know? He dumps on me. So that's it.
• 3

  One's mental state or state of mind.

  • Many of us, as gays, have been in the same headspace as Maurice: longing, lonely, and scared.
• 4

  informalA time and opportunity for reflection and thinking.

  • As a business owner, a truly effective business owner that is building a profitable business machine, you need headspace, thinking time, planning time, brainstorming time, education time, decision making time, questioning time and more thinking time.
• 5

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

• 6

  chemistrynatural-sciencesphysical-sciencesThe gas phase in contact and in equilibrium with a nonvolatile liquid in a sample.

• 7

  A place within a person (singlet or multiple) that they can visit or inhabit.

headspaceverb/ˈhɛdspeɪs/

• 1

  engineeringfirearmsgovernmentTo occupy a headspace.