Definition of: infusion

(in·fy′zhən) noun
1. The act of infusing, imbuing, or pouring in; instilation.
2. That which is infused; an admixture; tincture.
3. A pouring out or upon, as in baptism; an affusion.
4. The process of steeping or soaking any substance, as a vegetable or powder, in a liquid for the purpose of extracting its medicinal properties without boiling: distinguished from decoction.
5. The liquid extract so obtained: an infusion of tobacco.
6. Med. The operation of introducing saline or other solutions into the veins.