cross section - a section created by a plane cutting a solid perpendicular to its longest axis --1is a kind ofsection, plane section --1has particulars: profile
cross section - a sample meant to be representative of a whole population --2is a kind ofsample
cross section - (physics) the probability that a particular interaction (as capture or ionization) will take place between particles; measured in barns --3is a kind ofprobability, chance