| specificity constant | Ratio of the maximum velocity (Vmax) or kcat to the true Km value for a specific substrate in an enzyme-catalyzed reaction. (05 Mar 2000) |
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| diagnostic specificity | The probability (P) that, given the absence of disease (D), a normal test result (T) excludes disease; i.e., P(T/D). (05 Mar 2000) |
| organ specificity | Restriction of a characteristic or response to a particular organ of the body; it usually refers to that property of the immune response which differentiates one organ from another on the basis of antigen recognition, but the concept is not limited to immunology. (12 Dec 1998) |