[kee-bawrd, -bohrd]
the row or set of keys on a piano, organ, or the like.
a set of keys, usually arranged in tiers, for operating a typewriter, typesetting machine, computer terminal, or the like.
any of various musical instruments played by means of a pianolike keyboard, as a piano, electric piano, or organ.
verb (used with object), verb (used without object)
Also, key, key in. Computers. to enter (information) into a computer by means of a keyboard.
to set (text) in type, using a machine that is operated by a keyboard.

1810–20; key1 + board

keyboarder, keyboardist, noun
rekeyboard, verb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
keyboard (ˈkiːˌbɔːd)
1.  a.  a complete set of keys, usually hand-operated, as on a piano, organ, typewriter, or typesetting machine
 b.  (as modifier): a keyboard instrument
2.  (often plural) a musical instrument, esp an electronic one, played by means of a keyboard
3.  to set (a text, etc) in type, onto magnetic tape, or into some other medium, by using a keyboard machine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1819, from key (1) in sense of "mechanism of a musical instrument" + board. Originally of pianos, organs, etc., extended to other machines 1846. The verb is first recorded 1961. Keypad is from 1975; keypunch is from 1933. Keystroke first attested c.1910.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

keyboard definition

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.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Stop texting, typing, or mouse clicking and move your hands completely away
  from the keyboard.
Sumptuous singing and lyricism at the keyboard are always collectable.
All except for one small keyboard instrument on display.
Of course to really work for web access for instance, we'd have to also have an
  intelligent keyboard.
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