English Reference
noun

infusion

n.
US /ˌɪnˈfjuʒən/ UK /ɪnfjˈuːʒən/ in·fu·sion UK spelling infusions

  1. 01 B2 Upper Intermediate

    the act of adding a large amount of money or new resources to help a company or project.

    the introduction of a new element or quality into something, most commonly a significant injection of capital or resources into an organization.

    Simple

    The struggling airline needs a massive infusion of cash to stay in business.

    In context

    The startup's survival was secured by a timely infusion of venture capital, allowing them to scale their operations globally.

  2. 02 B2 Upper Intermediate Cooking

    a drink made by soaking herbs, tea, or fruit in hot water to get their flavour.

    a liquid extract resulting from the process of steeping a substance in a solvent, typically water, to extract its medicinal or flavourful properties.

    Simple

    She drank a warm herbal infusion of ginger and lemon to soothe her throat.

    In context

    The chef prepared a delicate infusion of saffron and cream to serve as the base for the seafood bisque.

  3. 03 C1 Advanced Technical Medicine

    the process of putting medicine or fluids directly into a person's vein.

    the continuous slow introduction of a solution, such as saline or medication, into a vein or other body part.

    Simple

    The patient received a slow infusion of antibiotics over several hours.

    In context

    The clinical protocol required a steady infusion of the experimental drug to maintain therapeutic levels in the patient's bloodstream.

  4. 04 C1 Advanced Formal

    the act of filling someone or something with a particular feeling or quality.

    the act of instilling or introducing a specific quality, idea, or emotion into a person or situation.

    Simple

    The new manager's arrival brought an infusion of energy to the tired team.

    In context

    The director's latest film benefited from an infusion of surrealism that challenged the audience's expectations of the genre.

    instillationintroduction

The engineered cells are then returned to the patient in a single infusion.

ScienceDaily· 30 Aug 2026

These rural areas seek new prisons for the infusion of money and jobs into the local economy.

The Conversation· 28 Aug 2026

From Middle English infusioun, from Old French infusion, from Latin infusio, infusionem (“a pouring into, a wetting, a dyeing, a flow”), from infundo.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin infusio
Level C1 · Advanced
Frequency Frequent
Updated