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The variety of English that is generally acknowledged as the model for the speech and writing of educated speakers, especially when contrasted with speech varieties that are limited to or characteristic of a certain region or social group.
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.
the English language in its most widely accepted form, as written and spoken by educated people in both formal and informal contexts, having universal currency while incorporating regional differences.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.