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.
The Jawas are a scavenger species. They comb the deserts of Tatooine in search of discarded scrap and wayward mechanicals. Using their cobbled-together weaponry, they can incapacitate droids and drag them to their treaded fortress-homes, immense sand-scarred vehicles known as sandcrawlers.