variants
also British immunise
immunizes; immunized; immunizing
: to give (someone) a vaccine to prevent infection by a disease
Many people had to be immunized after being exposed to the disease.
—often + againstAll the children have been immunized against polio.
Cite this Entry
“Immunize.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/immunize. Accessed 14 Apr. 2026.
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