What does AC mean when talking of years?

"AC" in the context of years stands for "Anno Domini" or "In the Year of the Lord". It is used to denote the years after the birth of Jesus Christ, according to the Christian calendar.

The term "AC" is often used in historical or religious contexts to refer to specific dates or time periods. For example, the year 2023 AC represents the 2023rd year since the birth of Jesus Christ.

In contrast to "AC", the term "BC" is used to denote the years before the birth of Jesus Christ. For instance, the year 1000 BC would represent the 1000th year before the birth of Jesus Christ.