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.
Jawns can mean anything as long as it is used in context. A verb, noun, pronoun, adverb, preposition, or even an exclamation. Jawns emphasizes the significance of the lack of anything else to say. Jawns originates from the word 'jawn' used in Philly.