/keuhn jungk"sheuhn/, n.1. Gram.a. any member of a small class of words distinguished in many languages by their function as connectors between words, phrases, clauses, or sentences, as and, because, but, however.b. any other word or expression of similar function, as in any case.2. the act of conjoining; combination.3. the state of being conjoined; union; association: The police, in conjunction with the army, established order.4. a combination of events or circumstances.5. Logic.a. a compound proposition that is true if and only if all of its component propositions are true.b. the relation among the components of such a proposition, usually expressed by AND or & or.6. Astron.a. the coincidence of two or more heavenly bodies at the same celestial longitude.b. the state of two or more such coinciding heavenly bodies.7. Astrol. the coincidence of two or more heavenly bodies at the same celestial longitude, characterized by a unification of the planetary energies; an astrological aspect.[1350-1400; ME conjunccio(u)n ( < AF) < L conjunction- (s. of conjunctio). See CONJUNCT, -ION]Syn. 2. joining, meeting, associating.
* * *in logic, a type of connective that uses the word “and” to join together two propositions. See connective.in astronomy, an apparent meeting or passing of two or more celestial bodies. The Moon is in conjunction with the Sun at the phase of New Moon, when it moves between the Earth and Sun and the side turned toward the Earth is dark. Inferior planets—those with orbits smaller than the Earth's (namely, Venus and Mercury)—have two kinds of conjunctions with the Sun. An inferior conjunction occurs when the planet passes approximately between Earth and Sun; if it passes exactly between them, moving across the Sun's face as seen from Earth, it is said to be in transit. A superior conjunction occurs when Earth and the other planet are on opposite sides of the Sun, but all three bodies are again nearly in a straight line. Superior planets, those having orbits larger than the Earth's, can have only superior conjunctions with the Sun. Conjunctions of planets with one another are considered of great importance in astrology. See also opposition.
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