from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A key on a computer keyboard that is pressed in combination with another key to activate a command.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A key on a personal computer or terminal keyboard used in combination to modify the function of other keys; normally labelled "Ctrl"

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (computer science) the key on a computer keyboard that is used (in combination with some other key) to type control characters


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