The Evolving Definition of “Vaccine” in the Merriam-Webster Dictionary for 2021

The popular online dictionary, Merriam-Webster.com, has had the same definition for "vaccine" for several years. However, that definition has now been updated at least twice in 2021. It now includes examples of mRNA "vaccines" such as Moderna and Pfizer, "viral vector" vaccines such as J&J and AstraZeneca, and a completely new definition to cover some "vaccines" the military is working on: "a preparation or immunotherapy that is used to stimulate the body's immune response against noninfectious substances, agents, or diseases."