Definitions
1.nounA fountainhead; a source.
2.nounA basis or foundation.
3.nounA move in which the gymnast places both hands on the mat with the top of the head about 6 inches in front, pushes off with the hands while flipping the legs overhead, and lands on the feet.
4.nounA spring that sits at the top of a mechanism, pushing the internal parts inward.
5.verbTo perform a headspring.