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.
jawn. 1  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. 2  a word used by people in philly, it can mean anything, like a fine girl, a blunt, really, it can be used for everything. it basically means thing.
There are many Categories of Jawn's when used to refer to a female See Side-Jawn=chick on the side, Old-Head Jawn=some older woman, Big Jawn=fat girl, Young-Jawn= a young girl. Spanish-Jawn= a spanish girl,Germantown-Jawn= a girl from gemantown....