n.
Pronunciation: ˌ re-tr ō - ' ak-sh ə n
Function: noun
Date: circa 1738
1 [ retroactive ] : retroactive operation (as of a law or tax)
2 [ retro- + action ] : a reciprocal action : REACTION
n.
Pronunciation: ˌ re-tr ō - ' ak-sh ə n
Function: noun
Date: circa 1738
1 [ retroactive ] : retroactive operation (as of a law or tax)
2 [ retro- + action ] : a reciprocal action : REACTION
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012