Etymology
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ab urbe condita 

with year-dates, an occasional Roman method of identifying a given year by reference to the time passed since founding of the city, which in 1c. B.C.E. was calculated to have taken place in what we would call 753 B.C.E. Literally "from the city founded;" the elements are ab "from" (see ab-) + ablative of urbs "city" (see urban) + fem. past participle of condere "put together, store," from assimilated form of com- "together" (see com-) + -dere "put" (from PIE root *dhe- "to put, place").

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A.U.C. 

as an abbreviation in Roman history in reckoning of dates it represent either ab urbe condita (q.v.) "from the founding of the city" or Anno Urbis Conditae "in the year of the founded city," from ablative of annus "year" (see annual (adj.)) + genitive of urbs "city" (see urban) + genitive of condita, fem. of conditus, past participle of condere "to set up, put together" (see abscond)

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