When a solution is hypertonic?

Let us put hypotonic into the mix. Hyper is more, hypo is less so that puts -tonic right in the middle, as a reference point.

That reference point is also called equilibrium. When a solution contains more solute that it would normally contain at equilibrium it is hypertonic, and when a solution has dissolved in it less than the amount of solute that it would normally contain at equilibrium it is hypotonic.