An entry in either a securable object’s discretionary access control list (DACL) or an object’s system access control list (SACL). In a DACL, the entry grants or denies permissions to a user or group. In a SACL, the entry specifies which security events to audit for a particular user or group or controls the Windows Integrity Level for the object.
— Computer ScienceAngiotensin converting enzyme. ACE converts an angiotensin to its activated form, angiotensin II, enabling it to function. Angiotensin II constricts blood vessels and elevates blood pressure.
— Medical ScienceTo pass a test, exam, etc. really easily. "Robert aced his physics exam."
— American Slang