A term with no free variables.
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 […]
- Close encounter
noun a purported observation of an unidentified flying object or extraterrestrial being(s)