conjunction

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The act of joining.
2. n. The state of being joined.
3. n. A joint or simultaneous occurrence; concurrence: the conjunction of historical and economic forces that created a depression.
4. n. One resulting from or embodying a union; a combination: "He is, in fact, a remarkable conjunction of talents” ( Jerry Adler).
5. n. Grammar The part of speech that serves to connect words, phrases, clauses, or sentences.
6. n. Grammar Any of the words belonging to this part of speech, such as and, but, as, and because.
7. n. Astronomy The position of two celestial bodies on the celestial sphere when they have the same celestial longitude.
8. n. Logic A compound proposition that has components joined by the word and or its symbol and is true only if both or all the components are true.
9. n. Logic The relationship between the components of a conjunction.

Century Dictionary and Cyclopedia

1. n. A joining or meeting of individuals or of distinct things; union; connection; combination; association.
2. n. In astronomy, the meeting of two or more stars or planets in the same longitude: as, the conjunction of the moon with the sun, or of Jupiter and Saturn. When a planet, as seen from the earth, is in the same direction as the sun, it is said to be in conjunction with the sun. This, however, in the case of an interior planet, may be either when it passes between the sun and the earth or when it is on the further side of the sun; the former is the inferior and the latter the superior conjunction. A superior planet can be in conjunction with the sun only when the sun is in a direct line between, it and the earth. See syzygy and opposition.
3. n. In grammar, a connective particle serving to unite clauses of a sentence, or coördinate words in the same sentence or clause, and indicating their relation to one another. There are two principal kinds of conjunctions, coordinating and subordinating: the former joining clauses of equal order or rank (as, he went and I came); the latter joining a subordinate or dependent clause to that on which it depends (as, I went where he was; he was gone when I came). Most conjunctions are of adverbial origin, and some, as, for instance, also, share almost equally the character of both parts of speech.

Wiktionary

1. n. The act of joining, or condition of being joined.
2. n. obsolete Sexual intercourse.
3. n. grammar A word used to join other words or phrases together into sentences. The specific conjunction used shows how the two joined parts are related. Example: Bread, butter and cheese.
4. n. astronomy The alignment of two bodies in the solar system such that they have the same longitude when seen from Earth.
5. n. astrology An aspect in which planets are in close proximity to one another.
6. n. logic The proposition resulting from the combination of two or more propositions using the ∧ () operator.

GNU Webster's 1913

1. n. The act of conjoining, or the state of being conjoined, united, or associated; union; association; league.
2. n. (Astron.) The meeting of two or more stars or planets in the same degree of the zodiac. See the Note under Aspect, n., 6.
3. n. (Gram.) A connective or connecting word; an indeclinable word which serves to join together sentences, clauses of a sentence, or words.

WordNet 3.0

1. n. something that joins or connects
2. n. the state of being joined together
3. n. the grammatical relation between linguistic units (words or phrases or clauses) that are connected by a conjunction
4. n. (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac
5. n. the temporal property of two things happening at the same time
6. n. an uninflected function word that serves to conjoin words or phrases or clauses or sentences