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stir1. 1  to move one's hand or an implement continuously or repeatedly through (a liquid or other substance) in order to cool, mix, agitate, dissolve, etc., any or all of the component parts: to stir one's coffee with a spoon. 2  to set in tremulous, fluttering, or irregular motion: A soft breeze stirred the leaves.
Definition: Distillation is the technique of heating a liquid to create vapor which is collected when cooled separate from the original liquid. Examples: Pure water can be separated from salt water through distillation. Salt water is boiled to create water steam, but the salt remains in the solution.