St. Gal?len (?g? l?n) n. 1. a canton in NE Switzerland. 442,350; 777 sq. mi. (2010 sq. km). 2. the capital of this canton. 74,106. French, St. Gall (s?? ?gal) German, Sankt Gallen. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.