O leveln. Chiefly British The earlier of two standardized tests in a secondary school subject.[O(rdinary) level.]O?-lev?el adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.O level (formerly, in Britain) n1. (Education) a. the basic level of the General Certificate of Education, now replaced by GCSEb. Also: O-level (as modifier): O level maths. 2. (Education) a pass in a particular subject at O level: he has eight O levels. Systematic name: Ordinary level Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014O lev?el (?o? ?l?v ?l) n. a public examination for British secondary-school students, testing basic knowledge in various subjects. Compare A level.[1950?55; O(rdinary)level]Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.