What is the Latin for BC?

There is no single Latin word that directly translates to "BC" (Before Christ). However, there are a few ways to express the concept in Latin:

* A.D.N. (Anno Domini Nostro) - This stands for "in the year of our Lord," and is used for years after the traditional birth year of Jesus Christ. To express "Before Christ," you would use A.D.N. followed by a negative number. For example, "100 BC" would be "A.D.N. -100."

* ante Christum natum - This literally translates to "before Christ's birth."

* ante annum Christi - This translates to "before the year of Christ."

These are the most common and accurate ways to express "BC" in Latin.