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 for embedded system
From The Free On-line Dictionary of Computing (30 December 2018) :

  embedded system
      Hardware and software which forms a component of
     some larger system and which is expected to function without
     human intervention.
     A typical embedded system consists of a single-board
     microcomputer with software in ROM, which starts running
     some special purpose application program as soon as it is
     turned on and will not stop until it is turned off (if ever).
     An embedded system may include some kind of operating system
     but often it will be simple enough to be written as a single
     program.  It will not usually have any of the normal
     peripherals such as a keyboard, monitor, serial connections,
     mass storage, etc. or any kind of user interface software
     unless these are required by the overall system of which it is
     a part.  Often it must provide real-time response.
     Usenet newsgroup: news:comp.arch.embedded.

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