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.
jawÂ·bone (jÃ´â²bÅnâ²) n. A bone of the jaw, especially the bone of the lower jaw. v. jawÂ·boned, jawÂ·bonÂ·ing, jawÂ·bones Slang v.tr. To try to influence or pressure through strong persuasion, especially to urge to comply voluntarily. v.intr. To urge voluntary compliance with official wishes or guidelines.