solution-n; 4 Senses

Sense Number 1: a homogeneous chemical mixture, often a liquid

Commentary: SOLUTION[+entity][+substance][+chemical][+mixture][+homogeneous]

He used a solution of peroxide and water on the wound.
John said the blue liquid in the flask was a solution of copper sulphate.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: the answer to a question or puzzle

Commentary: SOLUTION[+entity][+symbolic][+information][+answer][+to_problem]

The solution to today's crossword puzzle is on page 16.
Anyone who could give the right solution to the riddle could marry the princess.
The brilliant mathematician sketched a solution to Poincare's Conjecture. (a proof, not just a set of values as in Sense 3)

WordNet 3.0 Sense Numbers: 2

Sense Number 3: set of mathematical values that satisfy an equation

Commentary: SOLUTION[+entity][+mathematical][+set][+value][+satisfy][+equation]

There are two solutions for each of these quadratic equations.
The computer can calculate the solutions for these equations in a few seconds.

WordNet 3.0 Sense Numbers: 4

Sense Number 4: a method for solving a problem

Commentary: SOLUTION[+action][+method][+resolution][+problem]
NOTE: refers to some behavior or activity to achieve an end, not just information content (Sense 2)

Putting these reinforcing beams against the wall is only a short term solution to repairing the structural damage.
His solution to every problem is to just ignore it.
They are exploring possible solutions to the congested traffic flow in the city's center.

WordNet 3.0 Sense Numbers: 3, 5