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Valid in these dictionaries

TWL/NWL (Scrabble US/CA/TH)
SOWPODS/CSW (Scrabble UK / ALL)
ENABLE (Words with Friends)

Meaning of retroactive

1 definition found

From WordNet (r) 3.0 (2006) [wn]:

  retroactive
      adj 1: descriptive of any event or stimulus or process that has
             an effect on the effects of events or stimuli or process
             that occurred previously [ant: {proactive}]
      2: affecting things past; "retroactive tax increase"; "an ex-
         post-facto law"; "retro pay" [syn: {ex post facto},
         {retroactive}, {retro}]

Source : WordNet ® Princeton University. 2010.

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OCTWL / TWL : The official dictionary for scrabble game in United States, Canada and Thailand.
SOWPODS / CSW : UK and the rest of the world uses this dictionary for various word games including scrabble.
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