LOL you think MW was the only one to change?

https://www.cnsnews.com/article/national/susan-jones/cdcs-definition-vaccine-has-changed-over-time-protection-vs-immunity

The word "protection" has replaced the word "immunity" on the CDC definitions page, as it becomes clear that even fully vaccinated Americans are not "immune" to COVID variants, most recently, omicron.

As CNSNews.com reported on May 4, 2021, the CDC at that time defined vaccination as "The act of introducing a vaccine into the body to produce immunity to a specific disease."

But that definition has changed over time. The CDC website now defines vaccination as "the act of introducing a vaccine into the body to produce protection from a specific disease." ---------- Now tell me how the CDC also isn't the ultimate authority on words and their definitions aren't written by God.