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acta, under the Roman empire, an emperor's enactments which magistrates and succeeding emperors swore to observe, unless they had been explicitly rescinded immediately after an emperor's death: acta senatūs (‘enactments of the senate’), under the empire, the official record of proceedings in the senate; acta diurna (‘daily events’), a gazette of social and political news published daily from 59 BC and read both in Rome and in the provinces.