1. To divide cleanly or evenly into some smaller number of things. The mirror toppled over and split into three nearly identical shards. OK, I want the class to split into groups of eight and come up with five different ways that energy is produced.

2. To divide someone or something cleanly into some number or fraction of a whole. With one mighty swing of his magical axe, the Titan split the entire mountain into two. He split the pizza into six pieces so everyone could have a slice.