specificity

Short definition from Wiktionary

Noun

1. 1
   The state of being specific rather than general.
2. 2
   The extent to which a characteristic is specific to a given person, place, or thing; thus: The probability, in a binary classification test, of a true negative being correctly identified.
3. 3
   The extent to which a characteristic is specific to a given person, place, or thing; thus: The extent to which a particular diagnostic test is specific for, or a symptom or sign is specific to, a given condition.