The Collaborative International Dictionary of English v.0.48:

PC \PC\ n. (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]

   Syn: personal computer, microcomputer.
        [WordNet 1.5 +PJC]

The Collaborative International Dictionary of English v.0.48:

PC \PC\ (p[=e]`s[=e]") a.
   An initialism for politically correct. [Initialism]

   Syn: P. C., politically correct.
        [PJC]

WordNet (r) 3.0 (2006):

PC
    n 1: a small digital computer based on a microprocessor and
         designed to be used by one person at a time [syn: personal
         computer, PC, microcomputer]

The Free On-line Dictionary of Computing (19 January 2023):

PC

   1.  personal computer.

   2.  IBM PC.

   3.  program counter.

   4.  printed circuit.

   5.  Parallel C.