(n): happening or existing or done at the same time
(n): the state of being joined together
(n): the state of being joined or united or linked
(n): an uninflected function word that serves to conjoin words or phrases or clauses or sentences
(n): a word that is uninflected and serves a grammatical function but has little identifiable meaning
(n): the grammatical relation between linguistic units (words or phrases or clauses) that are connected by a conjunction
(n): a linguistic relation established by grammar
(n): (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac
(n): a casual or unexpected convergence
(n): something that joins or connects
(n): an instrumentality that connects
And don't start a sentence with a conjunction.