A Level Definition
noun
The later of two standardized tests in a secondary school subject, used as a qualification for entrance into a university.
American Heritage
The second, or advanced, level of British secondary-school examinations, taken usually two years after the first.
Webster's New World
A pass on any examination at this level.
Webster's New World
Origin of A Level
A(dvanced) level
From American Heritage Dictionary of the English Language, 5th Edition