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retroactive

audio pronunciation audio pronunciation
adjective
  • effective from a past date [Barron]
  • of a law which dates back to a period before its enactment [Nandigam]

More word meanings for retroactive
from leading online dictionaries:

Wiktionary:
retroactive @ wiktionary
WordNet:
retroactive @ wordnet.princeton.edu
Merriam-Webster Online:
retroactive @ M-W.com
MSN Encarta:
retroactive @ Encarta
American Heritage Dictionary of the English Language:
retroactive @ AHD provided by Yahoo! Education
Answers.com:
retroactive @ Answers.com
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