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Webster 1913 Edition

Noun.

[Gr. [GREEK] a decree, fr. [GREEK] to vote with a pebble, fr. [GREEK] pebble.]

(Gr. Antiq.)

A proposition adopted by a majority of votes; especially, one adopted by vote of the Athenian people; a statute.

J. P. Mahaffy.

psephism ‎(plural psephisms)

(historical, Ancient Greece) A proposition adopted by a majority of votes, especially by the vote of the Athenian people; a statute.
- John Pentland Mahaffy
  the well-known story of the Spartan psephism