Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for key from the 1913 edition of Webster's Revised Unabridged Dictionary. Define key using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 18
2. An instrument which is turned like a key in fastening or adjusting any mechanism; as, a watch key; a bed key, etc.
3. That part of an instrument or machine which serves as the means of operating it; as, a telegraph key; the keys of a pianoforte, or of a typewriter.
4. That part of a mechanism which serves to lock up, make fast, or adjust to position.
5. A piece of wood used as a wedge.
6. The last board of a floor when laid down.
7. A keystone.
9. A wedge to unite two or more pieces, or adjust their relative position; a cotter; a forelock.
14. A bar, pin or wedge, to secure a crank, pulley, coupling, etc., upon a shaft, and prevent relative turning; sometimes holding by friction alone, but more frequently by its resistance to shearing, being usually embedded partly in the shaft and partly in the crank, pulley, etc.
15. A family of tones whose regular members are called diatonic tones, and named key tone ( or tonic) or one ( or eight), mediant or three, dominant or five, subdominant or four, submediant or six, supertonic or two, and subtonic or seven. Chromatic tones are temporary members of a key, under such names as " sharp four," " flat seven," etc. Scales and tunes of every variety are made from the tones of a key.
16. A simplified version or analysis which accompanies something as a clue to its explanation, a book or table containing the solutions to problems, ciphers, allegories, or the like, or a table or synopsis of conspicuous distinguishing characters of members of a taxonomic group.
17. A bar or key, in a typewriter or typesetting machine, used for spacing between letters.
Part of Speech: verb transitive
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