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					entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
				
			that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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					surface go
the outer boundary of an artifact or a material layer constituting or resembling such a boundary
				
			the outer boundary of an artifact or a material layer constituting or resembling such a boundary
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		ceiling
the overhead upper surface of a covered space
	
				the overhead upper surface of a covered space
noun.artifact
	1 Subcategories
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				overhead go 
(nautical) the top surface of an enclosed space on a ship