headspace

Plural: headspaces

Noun

• the volume left at the top of a filled container (bottle or jar or tin) before sealing
• The space between the top of the contents of a container (such as a jar) and its seal (such as a lid).
• One's capacity for mental activity modeled as a physical space with limits; one's mental state or state of mind.
• Time and opportunity for reflection and thinking.
• The gap between the face of the bolt and the stopping surface for the cartridge.
• The gas phase in contact and in equilibrium with a nonvolatile liquid in a sample.
• A place within a person (singlet or multiple) that they can visit or inhabit.

Verb

• To occupy a headspace.

Synonyms

brainspace, headroom, ullage, wonderland