retroactive

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retro|ac|tive /r'etroʊ'æktɪv/
[ADJ]
If a decision or action is retroactive, it is intended to take effect from a date in the past. (FORMAL)
There are few precedents for this sort of retroactive legislation.
= retrospective
● retroactively [ADV] ADV with v
It isn't yet clear whether the new law can actually be applied retroactively.
= retrospectively

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