(military) an armored vehicle (usually equipped with caterpillar treads) that is used to transport infantry
"The APC rolled through the mud, carrying a squad of soldiers directly from the truck to the front line."
a drug combination found in some over-the-counter headache remedies (aspirin and phenacetin and caffeine)
"The doctor warned that taking this OTC pain reliever containing APC could damage the kidneys if used regularly."
Initialism of armored personnel carrier.
"The military convoy included several APCs to transport troops safely across the battlefield."
In plain English: An APC is an armored vehicle used by military forces to transport soldiers safely into battle areas.
"The APC arrived at the rally to transport thousands of supporters to the capital city."
Initialism of armor piercing capped.
"The tank fired an APC round to penetrate the enemy's reinforced hull."
"The APC is not included in this shipment because its contents are classified as hazardous material."
Initialism of A Perfect Circle.
"The band released their latest album under the name APC, standing for A Perfect Circle."