What does the Latin word Domini mean?
The Latin word Domini means Master or Lord. It appears in the abbreviation A.D., which stands for Anno Domini, meaning "the year of our Lord" on the Gregorian calendar. Domini is not Hebrew or Greek but Latin, and from Anno we get the word annual.
Les explains that A.D. comes from the two Latin words Anno Domini. Domini means Master or Lord, so A.D. stands for "the year of our Lord," which on the Gregorian calendar is zero. Everything before the year zero is called before Christ, or B.C., while everything after is called the year of our Lord, or A.D. Les also notes that some now change B.C. to B.C.E. and A.D. to C.E., meaning Common Era, in an effort to remove Christ from the picture.