Definitions of solution:

• noun:   the successful action of solving a problem

  Example: "The solution took three hours"

• noun:   a method for solving a problem

  Example: "The easy solution is to look it up in the handbook"

• noun:   a statement that solves a problem or explains how to solve the problem

  Example: "They were trying to find a peaceful solution"

• noun:   the set of values that give a true statement when substituted into an equation
• noun:   a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution

  Example: "He used a solution of peroxide and water"