ac·cu·ra·cy (?k?y?r-?-s?)n.1. Conformity to fact.2. Precision; exactness.3. The ability of a measurement to match the actual value of the quantity being measured.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.accuracy (?ækj?r?s?) n, pl -cies1. faithful measurement or representation of the truth; correctness; precision2. (General Physics) physics chem the degree of agreement between a measured or computed value of a physical quantity and the standard or accepted value for that quantityCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ac?cu?ra?cy (?æk y?r ? si) n., pl. -cies. 1. the condition or quality of being true, correct, or exact; precision; exactness. 2. the extent to which a given measurement agrees with the standard value for that measurement. 3. Math. the degree of correctness of a quantity, expression, etc. Compare precision (def. 4). [1655?65] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.