1a drink, remedy, or extract prepared by soaking tea leaves or herbs in liquid:a strong rosemary infusion
[mass noun] the process of preparing an infusion.
2 [mass noun] the introduction of a new element or quality into something:the infusion of $6.3 million for improvements [count noun]:an infusion of youthful talent
3 Medicine the slow injection of a substance into a vein or tissue:a four-hour intravenous infusion
