immunogenicity

This term is a specialized technical descriptor used primarily in immunology, pharmacology, and vaccine development. It describes a biological property rather than a process, focusing on the capacity of a substance to be recognized as foreign and trigger an immune reaction. It is distinct from antigenicity, which refers to the ability of a substance to bind to an antibody without necessarily triggering a full immune response.

As a technical noun representing a biological property, it is treated as an uncountable mass noun. It does not have a plural form in standard scientific usage, as it refers to the inherent quality of a substance rather than a countable unit of measurement.