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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 of impetus. 1  1a (1) : a driving force : impulse (2) : incentive, stimulusb : stimulation or encouragement resulting in increased activity. 2  2 : the property possessed by a moving body in virtue of its mass and its motion âused of bodies moving suddenly or violently to indicate the origin and intensity of the motion.