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|Noun||1.||natural enclosure - a naturally enclosed space|
cavern - any large dark enclosed space; "his eyes were dark caverns"
matrix - an enclosure within which something originates or develops (from the Latin for womb)
space - an empty area (usually bounded in some way between things); "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"