interstitial space
noun› An in-between space.
1
Broadly (architecture) The gaps between buildings/floors in architecture, used for systems and movement; the neglected or overlooked spaces between built structures, like alleys, courtyards, or empty lots.
2
Broadly (anatomy) The fluid-filled area between cells in tissues (interstitium).
3
Broadly (sociology) The informal, transitional zones where people from different groups or fields (e.g., hobbyists, professionals) interact.