Used to label an unusually large number of occurrances of a disease or condition in one place. An autism cluster would be an unusually large number of cases of autism in (perhaps) a single locality. Clusters constitute evidence in the search for causes of diseases and conditions.
Top definition. jawn. a word used by Philly cats to describe anything and everything. NY cats interject with the word joint but it doesn't convey the same feelings.
â¢ JAW (noun) The noun JAW has 3 senses: 1. the part of the skull of a vertebrate that frames the mouth and holds the teeth. 2. the bones of the skull that frame the mouth and serve to open it; the bones that hold the teeth. 3. holding device consisting of one or both of the opposing parts of a tool that close to hold an object. Familiarity information: JAW used as a noun is uncommon. â¢ JAW (verb)