re·​vac·​ci·​na·​tion (ˌ)rē-ˌvak-sə-ˈnā-shən How to pronounce revaccination (audio)
plural revaccinations
: the act of administering a vaccine again some period after an initial vaccination especially to strengthen or renew the immune response
The first vaccination is given after a cat is 16 weeks old. Thereafter, annual revaccination with a single dose is necessary for effective immunity.Cat Fancy
Revaccination produces protective antibody titers in only 18 to 25 percent of individuals who failed to respond to the initial immunization with hepatitis B vaccine.Scientific American Medicine Bulletin
revaccinate transitive verb
revaccinated; revaccinating
Make sure all dogs are vaccinated, and revaccinated if the immunization is more than two years old. New England Farmer
Therefore, if a cat's rabies vaccination expires anytime before April 1, 2017, the pet must be revaccinated prior to a 2016 cat license tag being issued.

Examples of revaccination in a Sentence

Recent Examples on the Web There is no fact better established in medical science than that persistent revaccination will practically exterminate smallpox. Mark Fischetti, Scientific American, 16 Dec. 2021 There will be an annual revaccination. Alexander Tin, CBS News, 16 Apr. 2021 In Prussia, where the law requires revaccination to be performed every seven years, death by small pox is of very rare occurrence. Mark Fischetti, Scientific American, 2 Nov. 2021 At the time, Massachusetts was one of eleven states that allowed officials to enforce mandatory immunizations; a resurgent outbreak had led the local health board to order vaccination or revaccination of the city’s inhabitants. Dhruv Khullar, The New Yorker, 8 Dec. 2020

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'revaccination.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1803, in the meaning defined above

Time Traveler
The first known use of revaccination was in 1803

Dictionary Entries Near revaccination

Cite this Entry

“Revaccination.” Dictionary, Merriam-Webster, Accessed 24 Jun. 2024.

Medical Definition


re·​vac·​ci·​na·​tion ˈrē-ˌvak-sə-ˈnā-shən How to pronounce revaccination (audio)
: vaccination administered some period after an initial vaccination especially to strengthen or renew immunity
revaccinate transitive verb
revaccinated; revaccinating
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