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

Her mother requested ketamine treatment, explaining that infusions of the drug had helped Maya in the past; hospital staff reported Beata to the Department of Children and Families, and she was accused of Munchausen syndrome by proxy. —Sophie Dodd, PEOPLE, 9 Nov. 2025

The medical plan ended up paying for most of the treatment associated with Murray’s colon cancer, which required surgery to remove, and the immunotherapy infusions to treat the bladder cancer that followed. —Sydney Franklin, Cincinnati Enquirer, 9 Nov. 2025

The study, which involved 15 volunteers, found one infusion of a drug that uses the CRISPR gene-editing technique could safely reduce cholesterol, as well as levels of harmful triglycerides, by about half. —NPR, 8 Nov. 2025

Side effects of the initial treatment were minimal, mostly irritation at infusion sites, according to the study. —Sandee Lamotte, CNN Money, 8 Nov. 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