| AD | not capable of being swayed or diverted from a course |
|---|---|
| AD | having the hardness of a diamond |
| AD | consisting of or having the hardness of adamant |
| AD | inflexibly |
| AD | a mountain peak in southwestern Washington in the Cascade Range (12,307 feet high) |
| AD | 2nd President of the United States (1735-1826) |
| AD | 6th President of the United States and son of the 2nd President (1767-1848) |
| AD | American Revolutionary patriot |
| AD | recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat |
| AD | a city in southern Turkey on the Seyhan River |
| AD | baobab |
| AD | African tree having an exceedingly thick trunk and fruit that resembles a gourd and has an edible pulp called monkey bread |