Ada´sa, or Adarsa, called also by Josephus Adazer, Adaco, and Acodaco, a city in the tribe of Ephraim, said to have been four miles from Beth-horon, and not far from Gophna. It was the scene of some important transactions in the history of the Maccabees (1 Maccabees 7:40; 1 Maccabees 7:45; Joseph. Antiq. xii. 10, 5; Bell. Jud. i. 1, 6).