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.
Holonyms (jaw is a part of...): face; human face (the front of the human head from the forehead to the chin and ear to ear) Meaning: Holding device consisting of one or both of the opposing parts of a tool that close to hold an object.