a region that is isolated from its surroundings by a boundary that admits no transfer of matter or energy across it.
a complete and seemingly unchangeable set of doctrines, ideas, or things; a self-contained system that is unaffected by outside influences
A physical system that does not interact with other systems. A closed system obeys the conservation laws in its physical description. Also called isolated system. Compare open system.
- Closed term
theory A term with no free variables. (1994-12-16)
noun, Surveying. 1. a traverse ending at its point of origin.
noun 1. a labor union in which admission of new members is restricted by rigid requirements.
noun 1. (in cosmology) a hypothetical expanding universe that contains sufficient matter to reverse the observed expansion through its gravitational contraction. closed universe A model of the universe in which the curvature of space is roughly spherical, entailing that the universe has finite size. An object moving in a straight line in a closed universe […]