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1.
the interchange of sections between pairing homologous chromosomes during the prophase of meiosis.(genetics)
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2.
a structure, such as a bridge, bearing a path for crossing over a river or highway.
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3.
votes from members of one political party cast for candidates of another party; -- called also crossover vote; as, there was a high crossover in this election. Also: crossover vote
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4.
a member of one political party who votes for a candidate of another party; -- called also crossover voter. Also: crossover voter
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5.
a U-shaped section of pipe which serves to pass one pipeline over another which is directly in its path.(Plumbing)