Webster's Revised Unabridged Dictionary · 1913

PC

PC , noun

(Computers) A personal computer; a computer{2} designed for use by one person at a time; -- contrasted with shared-time computers such as mainframes and minicomputers, which may be accessed by multiple users each operating from a different input device (in the 1990's, usually a terminal). A personal computer typically uses a microprocessor for its CPU. [Initialism]

PC (pē`sē") , adjective

An initialism for politically correct. [Initialism]