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1. Oxford Dictionary

   retroactively

   • IPA[ˌrɛtrəʊˈaktɪvli]

   英式

   • adv.
     with effect from a date in the past
2. • 釋義

   adv.

   副詞

   • 1. with effect from a date in the past the new rates will apply retroactively from January 1
3. • 更多解釋

   retroactively

   • IPA[ˌretrōˈaktəvlē]

   美式

   • adv.
     with effect from a date in the past: the new rates will apply retroactively from January 1

   Oxford American Dictionary