The Open Dictionary

retroactively

adverb

UK/ˌret.rəʊˈæk.tɪv.li/
US/ˌret.roʊˈæk.tɪv.li/

Definitions of retroactively adverb

  1. With effect from a date prior to its approval or enactment; applying to past events or situations.

    • The company decided to adjust employee salaries retroactively.

    • The new tax law will apply retroactively to the previous fiscal year.

    • The policy change will be effective retroactively from January 1st.