Open English Wordnet
Nouns
(n)crossing over, crossoverthe interchange of sections between pairing homologous chromosomes during the prophase of meiosis (n)crossover voter, crossovera voter who is registered as a member of one political party but who votes in the primary of another party (n)crossoverthe 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” (n)crossing, crosswalk, crossovera path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other