headspace

== English == === Alternative forms === head space, head-space === Etymology === From head +‎ space. === Pronunciation === IPA(key): /ˈhɛdspeɪs/ === Noun === headspace (countable and uncountable, plural headspaces) The space between the top of the contents of a container (such as a jar) and its seal (such as a lid). Synonyms: headroom, ullage (informal) One's capacity for mental activity modeled as a physical space with limits; one's mental state or state of mind. Synonym: brainspace Meronym: mindshare (informal) Time and opportunity for reflection and thinking. (firearms) The gap between the face of the bolt and the stopping surface for the cartridge. (chemistry) The gas phase in contact and in equilibrium with a nonvolatile liquid in a sample. (multiplicity slang) A place within a person (singlet or multiple) that they can visit or inhabit. Synonyms: innerworld, mindscape, wonderland === Verb === headspace (third-person singular simple present headspaces, present participle headspacing, simple past and past participle headspaced) (firearms) To occupy a headspace. === Anagrams === spacehead