Last Updated：2025/11/20

Retroactive. / (law) Formulated or enacted after some event, and then retroactively applied to it.

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ex post facto

Source Word

ex post facto

Adjective

not-comparable

Retroactive. / (law) Formulated or enacted after some event, and then retroactively applied to it.

Japanese Meaning

遡及的、さかのぼって効力を及ぼす / (法律用語) ある出来事の後に制定され、過去にさかのぼって適用される法規、すなわち事後制定法

The legislature attempted to pass an ex post facto law to punish past behavior.

立法府は過去の行為を罰するために遡及的な法律を可決しようとした。

Sense（1）

Retroactive.

Sense（2）

(law) Formulated or enacted after some event, and then retroactively applied to it.