The Collaborative International Dictionary of English v.0.48:

Keyboard \Key"board`\, n.
   The whole arrangement, or one range, of the keys[3] of an
   organ, piano, typewriter, etc.; that part of a device
   containing the keys[3] used to operate it.
   [1913 Webster]

WordNet (r) 3.0 (2006):

keyboard
    n 1: device consisting of a set of keys on a piano or organ or
         typewriter or typesetting machine or computer or the like
    2: holder consisting of an arrangement of hooks on which keys or
       locks can be hung

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "keyboard":
   autotype, choir, claviature, console, echo, eighty-eight,
   electrotype, fingerboard, great, ivories, keys, linotype, manual,
   monotype, organ manual, palaeotype, pedals, piano keys, solo,
   stereotype, swell



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

keyboard

    A hardware device consisting of a number of
   mechanical buttons (keys) which the user presses to input
   characters to a computer.

   Keyboards were originally part of terminals which were
   separate peripheral devices that performed both input and
   output and communicated with the computer via a serial line.
   Today a keyboard is more likely to be connected more directly
   to the processor, allowing the processor to scan it and detect
   which key or keys are currently pressed.  Pressing a key sends
   a low-level key code to the keyboard input driver routine
   which translates this to one or more characters or special
   actions.

   Keyboards vary in the keys they have, most have keys to
   generate the ASCII character set as well as various
   function keys and special purpose keys, e.g. reset or volume
   control.

   (2003-07-04)