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1. The concurrent operation by one central processing unit of two or more processes.
2. The engaging in more than one activity at the same time or serially, switching one's attention back and forth from one activity to another.
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. (Computer Science) computing the execution of various diverse tasks simultaneously
2. the carrying out of two or more tasks at the same time by one person
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
mul•ti•task•ing(ˌmʌl tiˈtæs kɪŋ, -ˈtɑ skɪŋ, ˌmʌl taɪ-)
the concurrent execution of two or more jobs by a single CPU.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.