noun

1. the act, means, or place of crossing over from one part or side, to another
2. ☆ a track by which a railroad train can be switched from one line to another
3. ☆ a person who votes for a candidate of a political party other than the party he or she usually supports
4. ☆ a crossover () musical style
5. Biol.
   1. crossing-over
   2. a character resulting from crossing-over

adjective

1. designating or of a circuit, network, etc. that divides amplified sound into frequency bands and distributes them to the proper component of a speaker system, as to a woofer or tweeter
2. designating or by voters who are crossovers the crossover vote
3. designating or of a form of popular music in which elements of musical genres that appeal to a limited audience are combined with more widely accepted forms to gain a larger audience crossover jazz
4. made up of elements appealing to more specialized tastes that have been combined to gain broader acceptance