noun (n)

• the temporal property of two things happening at the same time(noun.attribute)

  Synonym:
  co-occurrence, coincidence, concurrence
  

  source: wordnet30
• the state of being joined together(noun.state)

  Synonym:
  colligation, conjugation, junction
  

  source: wordnet30
• an uninflected function word that serves to conjoin words or phrases or clauses or sentences(noun.communication)

  Synonym:
  conjunctive, connective, continuative
  

  source: wordnet30
• the grammatical relation between linguistic units (words or phrases or clauses) that are connected by a conjunction(noun.linkdef)

  source: wordnet30
• (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac(noun.event)

  Synonym:
  alignment
  

  source: wordnet30
• something that joins or connects(noun.artifact)

  Synonym:
  junction
  

  source: wordnet30
• The act of conjoining, or the state of being conjoined, united, or associated; union; association; league.(noun)

  source: webster1913