What does a/c stand for?

Ante Cibum (before meals)

absolutely continuous

Abatement & Control

Activated Carbon

Activated carbon, also called activated charcoal, activated coal, carbo activatus or an "AC filter", is a form of carbon processed to have small, low-volume pores that increase the surface area available for adsorption or chemical reactions.

before a meal (from Latin ante cibum)

Air condition

Accept/counter

A/c does not stand for account or air conditioner; instead, it stands for accept/counter. This word is mostly used to suggest that a transaction be accepted or countered. It can also be used to express whether or not someone wants something.

Advisory Circulars

Air/Cloth