noun
a retroactive law or provision
adjective
relating to or affecting things that have happened in the past
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The new law will not be retroactive, meaning it will only apply to future cases.
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They can't make the rule retroactive, that wouldn't be fair to those who already followed it.
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It's like trying to pull a retroactive fast one on us, but we're not falling for it.
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Her apology felt like a retroactive attempt to fix things, but the damage was already done.