The Collaborative International Dictionary of English v.0.48:

Conjunction \Con*junc"tion\, n. [L. conjunctio: cf. F.
   conjunction. See Conjoin.]
   1. The act of conjoining, or the state of being conjoined,
      united, or associated; union; association; league.
      [1913 Webster]

            He will unite the white rose and the red:
            Smille heaven upon his fair conjunction. --Shak.
      [1913 Webster]

            Man can effect no great matter by his personal
            strength but as he acts in society and conjunction
            with others.                          --South.
      [1913 Webster]

   2. (Astron.) The meeting of two or more stars or planets in
      the same degree of the zodiac; as, the conjunction of the
      moon with the sun, or of Jupiter and Saturn. See the Note
      under Aspect, n., 6.
      [1913 Webster]

   Note: Heavenly bodies are said to be in conjunction when they
         are seen in the same part of the heavens, or have the
         same longitude or right ascension. The inferior
         conjunction of an inferior planet is its position when
         in conjunction on the same side of the sun with the
         earth; the superior conjunction of a planet is its
         position when on the side of the sun most distant from
         the earth.
         [1913 Webster]

   3. (Gram.) A connective or connecting word; an indeclinable
      word which serves to join together sentences, clauses of a
      sentence, or words; as, and, but, if.
      [1913 Webster]

            Though all conjunctions conjoin sentences, yet, with
            respect to the sense, some are conjunctive and some
            disjunctive.                          --Harris.
      [1913 Webster]

WordNet (r) 3.0 (2006):

conjunction
    n 1: the temporal property of two things happening at the same
         time; "the interval determining the coincidence gate is
         adjustable" [syn: concurrence, coincidence,
         conjunction, co-occurrence]
    2: the state of being joined together [syn: junction,
       conjunction, conjugation, colligation]
    3: an uninflected function word that serves to conjoin words or
       phrases or clauses or sentences [syn: conjunction,
       conjunctive, connective, continuative]
    4: the grammatical relation between linguistic units (words or
       phrases or clauses) that are connected by a conjunction
    5: (astronomy) apparent meeting or passing of two or more
       celestial bodies in the same degree of the zodiac [syn:
       conjunction, alignment]
    6: something that joins or connects [syn: junction,
       conjunction]

Moby Thesaurus II by Grady Ward, 1.0:

155 Moby Thesaurus words for "conjunction":
   Anschluss, abutment, abuttal, accompaniment, accordance, addition,
   adjacency, adjectival, adjective, adjoiningness, adverb, adverbial,
   adversative conjunction, affiliation, agglomeration, agglutination,
   aggregation, agreement, alliance, amalgamation, apposition,
   appulse, articulation, assimilation, association, attributive,
   blend, blending, bond, bracketing, cabal, cahoots, cartel,
   centralization, clustering, co-working, coaction, coalescence,
   coalition, coincidence, collaboration, collectivity, collusion,
   combination, combine, combined effort, combo, communication,
   composition, concatenation, concert, concerted action,
   concomitance, concordance, concourse, concurrence, confederacy,
   confederation, confluence, congeries, conglomeration, conjugation,
   conjunctive adverb, connection, consilience, consolidation,
   conspiracy, conterminousness, contiguity, convergence, cooperation,
   coordinating conjunction, copulation, copulative,
   copulative conjunction, correlative conjunction, correspondence,
   coterminousness, coupling, disjunctive, disjunctive conjunction,
   ecumenism, embodiment, encompassment, enosis, exclamatory noun,
   federalization, federation, form class, form word, function class,
   fusion, gathering, gerundive, hookup, inclusion, incorporation,
   integration, intercommunication, intercourse, interjection,
   interlinking, joinder, joining, jointure, junction, junta,
   juxtaposition, knotting, league, liaison, linkage, linking,
   marriage, meeting, meld, melding, merger, merging, package,
   package deal, pairing, parasitism, part of speech, participle,
   particle, partnership, past participle, perfect participle,
   perigee, perihelion, preposition, present participle, saprophytism,
   simultaneity, solidification, splice, subordinating conjunction,
   symbiosis, synchronism, syncretism, syndication, syneresis,
   synergy, synthesis, syzygy, tie, tie-in, tie-up, unification,
   union, united action, verbal adjective, wedding, yoking



The Free On-line Dictionary of Computing (30 December 2018):

AND
conjunction

    (Or "conjunction") The Boolean function which is
   true only if all its arguments are true.  The truth table
   for the two argument AND function is:

    A | B | A AND B
    --+---+---------
    F | F |    F
    F | T |    F
    T | F |    F
    T | T |    T

   AND is often written as an inverted "V" in texts on logic.  In
   the C programming language it is represented by the &&
   (logical and) operator.

   (1997-11-15)