One of the mysteries of the English language finally explained.
Of, relating to, or belonging to the aerarians. "aerarian tribune": a member of a class ranking below the equites.
Early 19th century (in an earlier sense). From classical Latin aerārius (adjective) of or connected with coinage, money, or the treasury, (noun) citizen of the lowest class, who paid only a poll tax + -an; originally after German Aerarier, plural.
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