First, people claimed that Merriam-Webster sneakily changed the definition of the word “anti-vaxxer” to include people who oppose laws that mandate vaccination. (It didn’t. It has always had the same definition.)
Now, social media posts are making another gripe with the online dictionary with assertions that it changed the definition of the word “vaccine.”
“Vaccine used to be defined as a substance that provides ‘immunity’ to a specific disease,” a post shared on Facebook said. “Now, Merriam Webster has literally changed the definition of ‘vaccine’ and removed the ‘immunity’ portion to possibly cover for the fact that Covid ‘vaccines’ don’t actually provide immunity from Covid.”
This is misleading. Merriam-Webster has revised its entry for the word “vaccine” as part of its continual revision of entries, but it did not remove references to immunity. Rather, it changed the phrase “increase immunity” to say, “stimulate the body’s immune response.” The current entry better captures how mRNA-based vaccines work compared with traditional vaccines.
The post was flagged as part of Facebook’s efforts to combat potential false news and misinformation on its News Feed. (Read more about our partnership with Facebook.)
For years, the dictionary definition for the word “vaccine” had had the following wording:
“A preparation of killed microorganisms, living attenuated organisms, or living fully virulent organisms that is administered to produce or artificially increase immunity to a particular disease.”
On May 24, 2021, dictionary editors revised it to read, in part:
“A preparation that is administered (as by injection) to stimulate the body’s immune response against a specific infectious agent or disease.”
It then goes on to include 10 examples of the word in use; with some being typical uses and some being quotations that show how vaccine is used in context. (These examples appear in light blue text in the online dictionary.)
“This definition has been revised to reflect both more scientifically accurate language and the fact that we have more space in the online dictionary,” said Peter Sokolowski, editor at large of Merriam-Webster.com. “We are now able to provide much more context and detail than previously possible in print dictionaries. The wording had originally been drafted in order to accommodate the space restrictions of our print editions, where definitions necessarily had to be as brief as possible.”
The dictionary further explains and links to related terms such as “attenuated” and “adjuvant,” as well as “messenger RNA” and “immune response.” These explanations and links, Sokolowski said, serve to give broader coverage to the term being defined.
“In particular, the definition for immune response provides a detailed description of how a vaccine actually works, and is therefore more specific, scientific, and complete than the more general term immunity,” he added.
Here is the definition of “immune response,” which readers can find linked in the vaccine entry:
“A bodily response to an antigen that occurs when lymphocytes identify the antigenic molecule as foreign and induce the formation of antibodies and lymphocytes capable of reacting with it and rendering it harmless — called also immune reaction.”
Our ruling
A Facebook post claims that Merriam-Webster changed the definition of vaccine and removed the portion about immunity.
This is misleading. The dictionary did recently revise its definition of vaccine to be more detailed. But it didn’t eliminate the portion about immunity. Rather, it changed the wording to say that vaccines stimulate the body’s immune response against a specific infectious agent or disease. The entry also references the definition of “immune response,” which is more detailed than before.
This claim presents an element of truth but leaves out critical facts that would give a different impression. That’s our definition for Mostly False.
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How to get vaccinated
The COVID-19 vaccine for ages 5 and up and booster shots for eligible recipients are being administered at doctors’ offices, clinics, pharmacies, grocery stores and public vaccination sites. Many allow appointments to be booked online. Here’s how to find a site near you:
Find a site: Visit vaccines.gov to find vaccination sites in your zip code.
More help: Call the National COVID-19 Vaccination Assistance Hotline.
Phone: 800-232-0233. Help is available in English, Spanish and other languages.
TTY: 888-720-7489
Disability Information and Access Line: Call 888-677-1199 or email DIAL@n4a.org.
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KIDS AND VACCINES: Got questions about vaccinating your kid? Here are some answers.
BOOSTER SHOTS: Confused about which COVID booster to get? This guide will help.
PROTECTING SENIORS: Here’s how seniors can stay safe from the virus.
COVID AND THE FLU: Get a flu shot and the COVID vaccine to avoid a ‘twindemic.’
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