What is the definition of range in physics?

Answer 1

the maximum distance that a charged particle, as a proton, can penetrate a given medium and still maintain sufficient kinetic energy to produce ionization in the medium. Souce: http://dictionary.reference.com/browse/Range

Answer 2

In physics, range refers to the distance a projectile travels horizontally before hitting the ground. It is affected by the initial velocity, launch angle, and gravitational force acting on the projectile.