The phrase 'ante diem tertium kalendas apriles' translates to 'the third day before the Kalends of April' in English. This expression is a specific way of indicating a date in the Roman calendar system, where the Kalends (or the first day) of each month is a key reference point. It utilizes ordinal numbers to denote the position of a day relative to the Kalends, showcasing how the Romans measured time with precision.
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