V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CPM
       Communication Processor Module (Motorola)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CPM
       Control Program for Microcomputers (OS, DR), "CP/M"


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CPM
       Cost Per Minute


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CPM
       Critical Path Method


The Jargon File (version 4.4.7, 29 Dec 2003):

CP/M
 /C?P?M/, n.

    [Control Program/Monitor; later retconned to Control Program for
    Microcomputers] An early microcomputer OS written by hacker Gary Kildall
    for 8080- and Z80-based machines, very popular in the late 1970s but
    virtually wiped out by MS-DOS after the release of the IBM PC in 1981.
    Legend has it that Kildall's company blew its chance to write the OS for
    the IBM PC because Kildall decided to spend a day IBM's reps wanted to meet
    with him enjoying the perfect flying weather in his private plane (another
    variant has it that Gary's wife was much more interested in packing her
    suitcases for an upcoming vacation than in clinching a deal with IBM). Many
    of CP/M's features and conventions strongly resemble those of early DEC
    operating systems such as TOPS-10, OS/8, RSTS, and RSX-11. See MS-DOS,
    operating system.


The Free On-line Dictionary of Computing (30 December 2018):

Control Program for Microcomputers
CPM
CP/M

    (CP/M) An early microcomputer operating
   system written by Gary Kildall of Digital Research for
   8080 and Zilog Z80-based 8-bit computers.  CP/M was very
   popular in the late 1970s but was virtually wiped out by
   MS-DOS after the release of the IBM PC in 1981.

   Many of CP/M's features and conventions strongly resemble
   those of early DEC operating systems such as TOPS-10,
   OS/8, RSTS and RSX-11.

   CP/M might have been the OS for the IBM PC instead of
   MS-DOS but Kildall wanted to keep control of his creation
   and only license it to IBM.  Big Blue however wanted to own
   and control it completely.  Kildall spent the day IBM's reps
   wanted to meet him enjoying the perfect flying weather in his
   private plane.

   [Did CP/M use the same FAT file system as MS-DOS?]

   (1996-01-07)