What does A.C. stand for?

What does A.C. mean?

AC	Agency Characteristic Governmental » US Government
AC	Authorize Capture Governmental » Military
AC	Authenticast Comet Computing » Software
AC	Accommodations Code Governmental » Transportation
AC	Anal Catch Miscellaneous » Funnies
AC	Adriana Cool Miscellaneous » Funnies
AC	After Cubs Community » Sports
AC	Ascendant Cusp Academic & Science » Astronomy
AC	Awfully Crummy Miscellaneous » Food
AC	Absolutist Cutest Internet » Chat
AC	Autocraft Carroll Business » Firms
AC	The Art Clan Community » Performing Arts
AC	Associazione Circle Community » Sports
AC	Area Command Governmental » Police
AC	Assist-Control (a form of mechanical ventilation) Medical » Physiology
AC	Administration Committee Community » Non-Profit Organizations
AC	Alternating Current Miscellaneous » Aircraft
AC	Advisory Committee Governmental » FDA
AC	Alternating Current Governmental » NASA
AC	Asphalt Concrete Miscellaneous » Construction
AC	Acre Miscellaneous » Unit Measures
AC	Collier (Auxiliary, Coal) Miscellaneous » Ship Types
AC	Assumption College Academic & Science » Universities
AC	'A' Complement Academic & Science » Mathematics
AC	Added Constraint Academic & Science » Mathematics