Definition of "Infusion" :

noun: the act of infusing or introducing a certain modifying element or quality

"The team's continued success is attributable to a steady infusion of new talent."

noun: (medicine) the passive introduction of a substance (a fluid or drug or electrolyte) into a vein or between tissues (as by gravitational force)

noun: the process of extracting certain active properties (as a drug from a plant) by steeping or soaking (usually in water)

noun: a solution obtained by steeping or soaking a substance (usually in water)