in militaryjargon meaning a course of action. (ex: firing solution, navigational solution)
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An ideal solution is one where the interactions of the molecules of the solvent with each other are equal to their interactions with the solutes.
If both solute and solvent exist in equal quantities (such as in a 50% ethanol 50% water solution), the concepts of "solute" and "solvent" become less relevant, but the substance that is more often used as a solvent is normally designated as the solvent (in this case, water).
When a solute is dissolved into a solvent, especially polar solvents, a structure forms around it (a process called solvation), which allows the solute-solvent interaction to remain stable.