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.
jaw noun (BODY PART). B2 [C] the âlower âpart of âyour âface that âmoves when you âopen âyour âmouth: a âbroken jawUS a âpunch in the jawUK a âpunch on the jaw He has a âstrong/âsquare jaw.