[ im-yuh-nahyz, ih-myoo-nahyz ]
/ 藞瑟m y蓹藢na瑟z, 瑟藞myu na瑟z /
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See synonyms for: immunize / immunizer on Thesaurus.com

verb (used with object), im路mu路nized, im路mu路niz路ing.
to make immune.
to render harmless or ineffective; neutralize.
Law. to grant (a witness) immunity.
In effect, this quiz will prove whether or not you have the skills to know the difference between 鈥渁ffect鈥 and 鈥渆ffect.鈥
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
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Also especially British, im路mu路nise .

Origin of immunize

First recorded in 1890鈥95; immune + -ize


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022


What鈥檚 the difference between immunize, vaccinate, and inoculate?

In the context of medicine, immunize, inoculate, and vaccinate are often used in overlapping ways, and for good reason鈥攖hey all involve introducing a substance (especially a vaccine) into a person鈥檚 body with the goal of preventing them from getting a particular disease.

Vaccinate is the most specific of the three terms, because it always involves introducing a vaccine, which usually consists of a small amount of a killed, weakened, or otherwise modified version of a disease (such as a virus or bacterium). While inoculate has other meanings outside the context of medicine, in modern healthcare it鈥檚 typically used interchangeably with vaccinate (though it鈥檚 used less commonly).

Immunize is slightly different鈥攊t means to provide immunity from a specific disease. While the goal of vaccinating someone is often to immunize them, not all vaccines provide permanent immunity. Some vaccines cause the body to become immune to a disease for a very long time, while others only lead to a temporary immunity, after which the body 鈥渇orgets鈥 how to make certain antibodies. In these cases, a booster shot or dose is often required, consisting of a follow-up vaccination to boost or renew the immunity gained from the earlier vaccination.

Want to learn more? Read the full breakdown of the difference between immunize, vaccinate, and inoculate.

Quiz yourself on immunize vs. vaccinate vs. inoculate!

True or False?

Immunize, vaccinate, and inoculate can be correctly used in some overlapping ways.

How to use immunize in a sentence

British Dictionary definitions for immunize



/ (藞瑟mj蕣藢na瑟z) /

to make immune, esp by inoculation

Derived forms of immunize

immunization or immunisation, nounimmunizer or immuniser, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for immunize

[ 沫my蓹-n墨z鈥 ]

To render immune.
To produce immunity in, as by inoculation.

Other words from immunize

im鈥瞞u鈥i鈥ation (-n沫-z膩sh蓹n) n.
The American Heritage庐 Stedman's Medical Dictionary Copyright 漏 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.