1. A place at which or the means by which a crossing is made.
2. A short connecting track by which a train can be transferred from one line to another.
3. Genetics: a. Crossing over; b. A characteristic resulting from the exchange of genetic material between homologous chromosomes during meiosis.
4. A registered member of one political party who votes in the primary of the other party.
5. a. The adaptation of a musical style, as by blending elements of two or more styles or categories, to appeal to a wider audience; b. A recording designed to appeal to more than one segment or portion of the listening audience; c. One that appeals to a wide or diverse audience.