A.D.
1. active duty.
2. in the year of the Lord; since Christ was born: Charlemagne was born in a.d. 742.
3. art director.
4. assembly district.
5. assistant director.
6. athletic director.
7. average deviation.
a.d.
1. after date.
2. before the day.
3. autograph document.
很多意思柳,你要那一個?