The January 2019 definition (almost a year before COVID started booming) from Wiktionary: https://en.wiktionary.org/w/index.php?title=vaccine&oldid=51346997 ht

The January 2019 definition (almost a year before COVID started booming) from Wiktionary: https://en.wiktionary.org/w/index.php?title=vaccine&oldid=51346997 https://en.wiktionary.org/w/index.php?title=vaccine&oldid=51... "(immunology) A substance given to stimulate the body's production of antibodies and provide immunity against a disease without causing the disease itself in the treatment, prepared from the agent that causes the disease, or a synthetic substitute." In this context, I think the mRNA would satisfy the definition of "synthetic substitute". In either case, this is merely semantics and it's the "GOTCHA!" you think it is.