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retro- +‎ act


retroact (third-person singular simple present retroacts, present participle retroacting, simple past and past participle retroacted)

  1. To act backward, or in return; to act in opposition; to be retrospective.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for retroact in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)