You do know that the meaning of words evolve I hope.

One example is the word guy.
It originated with Guy Fawkes from British history and this led to a Guy Fawkes day which became known as guy and eventually guy was used to mean a man
Guy was used mostly in the US and then became more widely used to replace words like fellow or bloke in different areas and in many uses now can refer to both sexes.

So look at how the word vaccine is used today to mean a number of different things mostly to do with giving animals (yes humans are animals too) resistance to diseases and even to refer to malicious programs on computers.

So here is a definition covering vaccine for the British Columbia centre for disease control

Definitions
Acellular vaccine: the vaccine is made only from purified specific antigenic parts of a bacterium rather
than the whole killed bacterium (e.g., acellular pertussis).
Adsorbed vaccine: a vaccine containing an adjuvant to assist in the retention of the antigen at the
injection site and enhance the immune response by degree or duration.
Combination vaccine: vaccine that has been developed to protect against more than one type of infection
(e.g., INFANRIX hexa®, QUADRACEL®).
Conjugate polysaccharide vaccine: vaccine in which the polysaccharide is chemically combined with a
protein molecule to increase efficacy and immunogenicity (e.g., Hib, pneumococcal, and meningococcal
conjugate vaccines).
Excipients: inactive ingredients that are necessary for production of a finished pharmaceutical formulation.
Adjuvants, preservatives, and other additives are excipients, essential components of vaccines.
Live attenuated vaccine: the vaccine contains whole, living bacteria or viruses that induce immunity by
actively replicating within the host. Attenuated means the vaccine strains are weakened so infection is
usually inapparent or very mild.
Primary series: an initial series of vaccinations designed to give a primary antibody response. The series
may be followed by an additional booster dose(s) to give a secondary immune response. (e.g., first 3
doses of DTaP-HB-IPV-Hib vaccine – INFANRIX hexa® at 2, 4, and 6 months followed by the booster
dose at 18 months).
Pure polysaccharide vaccine: vaccine produced from the polysaccharide (sugar) coating of an
encapsulated bacterium (e.g., pneumococcal and meningococcal polysaccharide vaccines).
Recombinant vaccine: vaccine produced by genetic engineering technology (e.g., hepatitis B vaccine is
produced by the insertion of the segment of the viral gene that makes the surface protein of a hepatitis B
virus into the gene of a yeast cell. The yeast cells are then instructed to make surface protein by the viral
gene.).
Toxoid: a deactivated form of a bacterial toxin which has been chemically processed so that it is still
immunogenic (e.g., tetanus toxoid). Once the toxin has been inactivated, it is called a toxoid.
Communicable Disease Control Manual Chapter 2: Immunization
Supporting Documents - Definitions
May 2009

https://www.bccdc.ca/resource-gallery/Documents/Guidelines%20and%20Forms/Guidelines%20and%20Manuals/Epid/CD%20Manual/Chapter%202%20-%20Imms/Definitions.pdf

And note the date of May 2009 so it is not that recent a definition