Solution

n.hopeful, capableprofessional

Meaning 1

A method or answer that resolves a problem.

Reach for it when naming a workable response supported by the actual cause and constraints

A raised intake pipe provided a durable solution to the sediment problem.

playful
fix
when a direct informal correction is enough
not when Fix can imply a temporary patch.
everyday
answer
when a question or problem has a clear response
not when An answer may be theoretical and not workable.
professional
approach
when a promising method has not yet proved successful
not when An approach is more honest than solution before validation.
professional
remedy
when correcting harm or illness is central
not when A remedy may only reduce symptoms.
professional
resolution
when a dispute or uncertainty is settled
not when Resolution describes the outcome more than the method.

A liquid mixture in which one substance is dissolved in another.

Reach for it when describing a specific chemical mixture without implying a problem answer

The technician prepared a fresh saline solution.

everyday
mixture
when combined substances are the broad fact
not when A mixture need not have anything dissolved.
professional
dissolution
when the process or result of dissolving is central
not when Dissolution can also mean ending an organization.
professional
preparation
when a formulated liquid product is meant
not when Preparation is broad and need not be a solution.

practical solution
The workshop developed a practical solution using standard parts.
lasting solution
Reliable drainage offered a lasting solution rather than another patch.
aqueous solution
The aqueous solution remained clear after mixing.
saline solution
Use sterile saline solution for the approved cleaning step.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.