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Any of various instruments for comparing a measured property of an object, such as its shape, color, or brightness, with a standard.
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. (General Engineering) any instrument used to measure a property of a system by comparing it with a standard system
2. (Electronics) an electric circuit that compares two signals and gives an indication of the extent of their dissimilarity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
com•par•a•tor(kəmˈpær ə tər, ˈkɒm pəˌreɪ-)
1. any of various instruments for making comparisons, as of lengths, distances, or tints of colors.
2. a circuit for comparing two signals, as readings of duplicate information stored in a digital computer.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.