| key | (noun) metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated | - |
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| (noun) a lever (as in a keyboard) that actuates a mechanism when depressed | - |
| (noun) mechanical device used to wind another device that is driven by a spring (as a clock) | Synonyms: winder |
| (noun) the central building block at the top of an arch or vault | Synonyms: headstone, keystone |
| (noun) pitch of the voice | - |
| (noun) something crucial for explaining | - |
| (noun) any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music | Synonyms: tonality |
| (noun) a generic term for any device whose possession entitles the holder to a means of access | - |
| (noun) a list of words or phrases that explain symbols or abbreviations | - |
| (noun) a list of answers to a test | - |
| (noun) (basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court | Synonyms: paint |
| (noun) a coral reef off the southern coast of Florida | Synonyms: cay, Florida key |
| (noun) a winged often one-seed indehiscent fruit as of the ash or elm or maple | Synonyms: key fruit, samara |
| (noun) a kilogram of a narcotic drug | - |
| keyboard | (noun) holder consisting of an arrangement of hooks on which keys or locks can be hung | - |
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| (noun) device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like | - |
| keyboardist | (noun) a musician who plays a keyboard instrument | - |
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| keycard | (noun) a plastic card that has a magnetically coded strip that is scanned in order to operate a mechanism | - |
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| 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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