"crossover" in the noun sense
1. crossing over, crossover
the interchange of sections between pairing homologous chromosomes during the prophase of meiosis
2. crossover voter, crossover
a voter who is registered as a member of one political party but who votes in the primary of another party
3. crossover
the appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience
"a jazz-classical crossover album"
4. crossing, crosswalk, crossover
a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
Source: WordNet® (An amazing lexical database of English)
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