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.
1 Jawa, Jordan, archaeological site in Jordan. 2  Chek Jawa, a cape and the name of its 100-hectare wetlands located on the south-eastern tip of Pulau Ubin off the coast of Singapore. 3  Karimun Java, an archipelago of 69 islands in the Java Sea, Indonesia, approximately 80 kilometres northwest of Jepara. East Java, also called Jawa Timur, a province on the Indonesian island of Java. 2  Central Java, also called Jawa Tengah, a province on the Indonesian island of Java. 3  West Java, also called Jawa Barat, a province on the Indonesian island of Java. 4  Jawa Dam (Jordan) , remains of water works dating from 3000 BC.