adaptive immunity

This term refers to the specialized, acquired defense system of the body. It is distinguished from innate immunity, which provides immediate but non-specific protection. The hallmark of this system is its ability to remember specific antigens, ensuring that subsequent encounters with the same pathogen trigger a faster and more potent response.

In a clinical or biological context, the term is almost always used as an uncountable noun. It describes a physiological process or a systemic capability rather than a discrete object. Consequently, it does not typically take a plural form in professional medical literature.