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1. Application of a subsequent rule or condition to something that occurred at a previous time.
2. An opposing or reciprocal action; a reaction.
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. to act in opposition
2. to influence or have reference to past events
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. to act in opposition; react.
2. to have reference to or influence on past occurrences.
Past participle: retroacted
Collins English Verb Tables © HarperCollins Publishers 2011