Crossover refers to the act of crossing from one side to another, or the point at which this happens.
In popular culture, crossover describes a work that combines two or more franchises, such as when characters from different series meet.
The term "crossover" also refers to:
1. A vehicle that combines features of an SUV and a passenger car
2. In genetics, the exchange of genetic material between chromosomes
3. In music, when an artist or song appeals to multiple audiences