1. The interchange of sections between pairing homologous chromosomes during the prophase of meiosis Noun
2. A voter who is registered as a member of one political party but who votes in the primary of another party Noun
3. The appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience Noun
4. A path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other Noun