1994 American Heritage Dictionary and 1973 Webster’s New World Dictionary
Vaccine: A preparation of a weakened or killed pathogen, such as a bacterium or virus, used to vaccinate
Vaccinate: to inoculate with a vaccine in order to produce immunity to an infectious disease
Pandemic: Wide Spread; general. Epidemic over a wide geographic area or region. A pandemic disease.
Epidemic: Spreading rapidly among many individuals in an area. A contagious disease that spreads rapidly. A rapid spread or development.
Merriam Webster Dictionary of the English Language (1970s)
Pandemic: A widespread outbreak of disease.
Vaccine: of or from cows; so called from the derivation of smallpox vaccine from cows; material (as a preparation of killed or weakened virus or bacteria) used in vaccinating to induce immunity to a disease.
Vaccinate: to inoculate with a related harmless virus to produce immunity to smallpox; also to administer a vaccine usually by injection.
Vaccination: the act of or the scar left by vaccinating
NEW — 2021 Google definition
Vaccine: a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease.
Pandemic: (of a disease) prevalent over a whole country or the world.
Epidemic: a widespread occurrence of an infectious disease in a community at a particular time.
What is the difference between an epidemic and a pandemic? According to the Center for Disease Control and Prevention (CDC), the difference between an epidemic and a pandemic is that: Epidemic is a sudden outbreak of a disease in a certain geographical area. Pandemic is an outbreak of a disease that has spread across several countries or continents. Jun 2, 2021