Source : Webster's Revised Unabridged Dictionary (1913)

Infusion \In*fu"sion\, n. [L. infusio a pouring in: cf. F.
   infusion. See {Infuse}, v. t.]
   1. The act of infusing, pouring in, or instilling;
      instillation; as, the infusion of good principles into the
      mind; the infusion of ardor or zeal.

            Our language has received innumerable elegancies and
            improvements from that infusion of Hebraisms.
                                                  --Addison.

   2. That which is infused; suggestion; inspiration.

            His folly and his wisdom are of his oun growth, not
            the echo or infusion of other men.    --Swift.

   3. The act of plunging or dipping into a fluid; immersion.
      [Obs.] ``Baptism by infusion.'' --Jortin.

   4. (Pharmacy)
      (a) The act or process of steeping or soaking any
          substance in water in order to extract its virtues.
      (b) The liquid extract obtained by this process.

                Sips meek infusion of a milder herb. --Cowper.

Source : WordNet®

infusion
     n 1: a solution obtained by steeping or soaking a substance
          (usually in water) [syn: {extract}]
     2: the process of extracting certain active properties (as a
        drug from a plant) by steeping or soaking (usually in
        water)
     3: (medicine) the passive introduction of a substance (a fluid
        or drug or electrolyte) into a vein or between tissues (as
        by gravitational force)
     4: 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"