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.
Definition of jawbone. 1  transitive verb. : 2  to speak forcefully and persuasively to jawboned them into accepting the deal. 3  intransitive verb. :  to talk especially forcefully and persuasively jawboning about the tax cuts.