IPA: /ˌɪmjunəˈdʒɛnɪsɪti/
KK: /ɪˌmjunəˈdʒɛnɪsɪti/
The ability of a substance to trigger a response from the immune system.
The immunogenicity of the vaccine was tested in clinical trials.
Immunogenicity → It is formed from "immunis" (from Latin, meaning exempt or free from) and "genus" (from Latin, meaning kind or origin) combined with the suffix "-ity" (meaning the state or condition of). The term refers to the state or condition of being able to provoke an immune response.
Think of 'immunis' meaning exempt and 'genus' meaning kind — together they describe the condition of something that can provoke an immune response.
No commonly confused words.