One who or that which is not acase (of a disease, a type of thing being explained, etc.).
1989 April 23, AP, “Jurors Mark 2 Years on California Abuse Case”, inThe New York Times[1]:
Mr. Buckey's attorney, Danny Davis, said, "The case has dragged on because it was anoncase whipped up by people who had differing ambitions that were not in the interest of this institution or the children."
2013, Gillian Russell, Delia Graff Fara,Routledge Companion to Philosophy of Language, page144:
We turn next to the puzzle of borderlineness: If Harry is intermediate between clear cases and clearnoncases of baldness, “Is Harry bald?” seems to have no good, direct, answer.