Meaning 1:
Appearance Engineering Committee.
Meaning 2:
Atomic Energy Commission
Meaning 3:
Automotive Electronics Council. The AEC was originally established by Chrysler, Delco Electronics, and Ford for the purpose of establishing common part-qualification and quality standards. Components meeting these qualification specifications are considered suitable for use in the harsh automotive environment without additional component-level testing.
Meaning 4:
Automotive Emission Control.