infusion

noun

in·​fu·​sion in-ˈfyü-zhən 

1

: the act or process of infusing

an infusion of new ideas

2

: a product obtained by infusing

herbal infusions

3

: the continuous slow introduction of a solution especially into a vein

Examples of infusion in a Sentence

Her ideas have brought a new infusion of vitality to the organization.

a strong infusion of tea

a medicinal drink made by infusion of herbs

Recent Examples on the Web

How ketamine therapy works in the brain A few months after that Google search, Jacintha and Lucy walked into the Northwest Ketamine Clinic’s Bellevue, Washington, outpost, where Lucy began the first of 12 ketamine infusion sessions, all administered in April and May of 2023. —Rachel Hale, USA Today, 10 Sep. 2025

Biologic drugs, made from living organisms and usually taken by injection or infusion, are expensive treatments for complex chronic conditions such as cancer and autoimmune diseases. —Ge Bai, Forbes.com, 9 Sep. 2025

Unrivaled's latest cash infusion means a dramatic rise in its valuation from just one year ago when the league was valued at $95 million, according to a person familiar with the league who spoke on the condition of anonymity about internal matters. —Jessica Golden, CNBC, 8 Sep. 2025

The process is repeated six weeks apart, typically in the form of six infusion rounds and imaging scans. —Noah Lyons, San Diego Union-Tribune, 6 Sep. 2025

Word History

Etymology

Middle English infusion, infusioun "act of pouring in (a medicine), injection, what is poured in, liquid extract," borrowed from Anglo-French & Latin; Anglo-French infusion "liquid extract," borrowed from Latin infūsiōn-, infūsiō "pouring in (of a medicament)," from infud-, variant stem of infundere "to pour in, instill" + -tiōn-, -tiō, suffix of action nouns — more at infuse

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for infusion

• allusion
• collusion
• conclusion
• confusion
• contusion
• delusion
• diffusion
• effusion
• exclusion
• extrusion
• illusion
• inclusion

Kids Definition

infusion

noun

in·​fu·​sion in-ˈfyü-zhən 

1

: the act or process of infusing

an infusion of new ideas

2

: a product obtained by infusing

a strong infusion of tea

Medical Definition

infusion

noun

in·​fusion in-ˈfyü-zhən 

1

a

: the introducing of a solution (as of glucose or salt) especially into a vein

also : the solution so used

b(1)

: the steeping or soaking usually in water of a substance (as a plant drug) in order to extract its soluble constituents or principles compare decoction sense 1

(2)

: the liquid extract obtained by this process

2

: a watery suspension of decaying organic material

culturing soil amebas in lettuce infusion