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Making use of or written in one language only.
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.
1. (Linguistics) of or relating to only one language
2. (Linguistics) chiefly Canadian knowing only one language
(Linguistics) chiefly Canadian a person who knows only one language
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
u•ni•lin•gual(ˌyu nəˈlɪŋ gwəl)
using only one language; monolingual.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.