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Ex postfacto
Ex post facto Ex" post` fac"to, or Ex postfacto Ex"
post`fac"to ([e^]ks" p[=o]st" f[a^]k"t[-o]). [L., from what is
done afterwards.] (Law)
From or by an after act, or thing done afterward; in
consequence of a subsequent act; retrospective.
Meaning of Ex postfacto from wikipedia