Astronomy Advanced Composition Explorer
• advanced computing environment
• Engineering advanced cooled engine
• (eɪs) Advisory Centre for Education
• Med. alcohol-chloroform-ether (anaesthetic)
• (eɪs) Allied Command Europe
• American Council on Education
• (eɪs) Biochem. , Med. angiotensin-converting enzyme (as in ACE inhibitor )
• (USA ) Army Corps of Engineers
• Association for the Conservation of Energy
• (Member of the) Association of Conference Executives
• Association of Consulting Engineers
• Association of Cultural Exchange
• Australian College of Education
• (eɪs) Computing Automatic Computing Engine