psephism
A proposition adopted by a majority of votes, especially by the vote of the Athenian people; a statute.
historical
No psephism shall pass to the commons before the senate's supervisal. The tablets on which the psephisms are engraved are by no means to be removed.
Where it comes from
Ancient Greek ψήφισμα (psḗphisma, “a decree”) from ψηφίζω (psēphízō, “to vote”)
Adapted from the Wiktionary entry psephism (CC BY-SA 4.0).