Pronunciation: (ā'su),[key] —n. a king of Judah, 913?–873? b.c. I Kings 15:8–24.
1. Acoustical Society of America.
2. American Standards Association: former name of the American National Standards Institute.
3. the numerical exposure index of a photographic film under the system adopted by the American Standards Association, used to indicate the light sensitivity of the film's emulsion.