A.U.C.

1. from the founding of the city (of Rome in 753? B.C.). The year 360 A.U.C. would be the 360th year after the founding of Rome. [ < L ab urbe condita]

2. in the year from the founding of the city (of Rome in 753? B.C.).

[ < L anno urbis conditae]

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A.U.C.,

in the year since the founding of the city (of Rome, in 753 _B.C. according to legend); Latin, ab urbe condita or anno urbis conditae.