Here are some ways to quantify this:

* pH: A basic solution has a pH greater than 7. The higher the pH, the more basic the solution.

* pOH: A basic solution has a pOH less than 7. The lower the pOH, the more basic the solution.

* [OH-]: A basic solution has a hydroxide ion concentration greater than 1 x 10^-7 M.

* [H+]: A basic solution has a hydrogen ion concentration less than 1 x 10^-7 M.

Remember that pH and pOH are related by the equation: pH + pOH = 14.