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A-O.K. (informal) perfectly fine; in excellent working order.
a.k.a. abbreviation of "also known as."
J. K. Rowling pen name of British author Joanne Rowling, best known for her fiction series relating the adventures of a young wizard named Harry Potter (b.1965).
OK1 (informal) acceptable; all right; satisfactory. [5 definitions]
pre-K shortened form of "prekindergarten," schooling for very young children that prepares them for kindergarten.
vitamin K in human nutrition, a substance produced in the intestines by bacteria, or acquired in the diet from milk or green vegetables, required for the synthesis of blood-clotting proteins.