| keyfob | (noun) A small object fastened to a key chain or key ring and designed to be comfortably grasped. | Synonyms: key fob |
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| keyhole | (noun) the hole where a key is inserted | - |
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| keynote | (noun) a fundamental or central idea | - |
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| (noun) (music) the first note of a diatonic scale | Synonyms: tonic |
| (noun) the principal theme in a speech or literary work | - |
| keypad | (noun) a keyboard that is a data input device for computers; arrangement of keys is modelled after the typewriter keyboard | Synonyms: computer keyboard |
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| keystone | (noun) the central building block at the top of an arch or vault | Synonyms: headstone, key |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, linchpin, lynchpin, mainstay |
| keystroke | (noun) the stroke of a key; one depression of a key on a keyboard | Synonyms: key stroke |
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