key
/kiː/
Dictionary
noun
- An object designed to open and close a lock.
- An object designed to fit between two other objects (such as a shaft and a wheel) in a mechanism and maintain their relative orientation.
- A crucial step or requirement.
"The key to solving this problem is persistence."
- A guide explaining the symbols or terminology of a map or chart; a legend.
"The key says that A stands for the accounting department."
- A guide to the correct answers of a worksheet or test.
"Some students cheated by using the answer key."
- One of several small, usually square buttons on a typewriter or computer keyboard, mostly corresponding to text characters.
"Press the Escape key."
- In musical instruments, one of the valve levers used to select notes, such as a lever opening a hole on a woodwind.
- In instruments with a keyboard such as an organ or piano, one of the levers, or especially the exposed front end of it, which are depressed to cause a particular sound or note to be produced.
- The lowest note of a scale; keynote.
- In musical theory, the total melodic and harmonic relations, which exist between the tones of an ideal scale, major or minor; tonality.
- In musical theory and notation, the tonality centering in a given tone, or the several tones taken collectively, of a given scale, major or minor.
- In musical notation, a sign at the head of a staff indicating the musical key.
- The general pitch or tone of a sentence or utterance.
- A modification of an advertisement so as to target a particular group or demographic.
- An indehiscent, one-seeded fruit furnished with a wing, such as the fruit of the ash and maple; a samara.
- A manual electrical switching device primarily used for the transmission of Morse code.
- A piece of information (e.g. a passphrase) used to encode or decode a message or messages.
- A password restricting access to an IRC channel.
- In a relational database, a field used as an index into another table (not necessarily unique).
- A value that uniquely identifies an entry in a container.
- The free-throw lane together with the circle surrounding the free-throw line, the free-throw lane having formerly been narrower, giving the area the shape of a skeleton key hole.
"He shoots from the top of the key."
- A series of logically organized groups of discriminating information which aims to allow the user to correctly identify a taxon.
- A piece of wood used as a wedge.
- The last board of a floor when laid down.
- A keystone.
- That part of the plastering which is forced through between the laths and holds the rest in place.
- A wooden support for a rail on the bullhead rail system.
- The degree of roughness, or retention ability of a surface to have applied a liquid such as paint, or glue.
"The door panel should be sanded down carefully to provide a good key for the new paint."
- The thirty-third card of the Lenormand deck.
- (print and film) The black ink layer, especially in relation to the three color layers of cyan, magenta, and yellow. See also CMYK.
- A color to be masked or made transparent.
verb
- To fit (a lock) with a key.
- To fit (pieces of a mechanical assembly) with a key to maintain the orientation between them.
- To mark or indicate with a symbol indicating membership in a class.
- (telegraphy and radio telegraphy) To depress (a telegraph key).
- To operate (the transmitter switch of a two-way radio).
- (more usually to key in) To enter (information) by typing on a keyboard or keypad.
"Our instructor told us to key in our user IDs."
- To vandalize (a car, etc.) by scratching with an implement such as a key.
"He keyed the car that had taken his parking spot."
- To link (as one might do with a key or legend).
- To be identified as a certain taxon when using a key.
- To modify (an advertisement) so as to target a particular group or demographic.
- To attune to; to set at; to pitch.
- To fasten or secure firmly; to fasten or tighten with keys or wedges.
adjective
- Indispensable, supremely important.
"He is the key player on his soccer team."
- Important, salient.
"She makes several key points."
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