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.
A guide explaining the symbols or terminology of a map or chart; a legend.
A guide to the correct answers of a worksheet or test.
One of several small, usually square buttons on a typewriter or computer keyboard, mostly corresponding to text characters.
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.
A scale or group of pitches constituting the basis of a musical composition.
A scale or group of pitches constituting the basis of a musical composition.
A scale or group of pitches constituting the basis of a musical composition.
A scale or group of pitches constituting the basis of a musical composition.
A scale or group of pitches constituting the basis of a musical composition.
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 password or 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.
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 thirty-third card of the Lenormand deck.
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.

Indispensable, supremely important.
Important, salient.

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.
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.
(colloquial) To vandalize (a car, etc.) by scratching with an implement such as a key.
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.
To prepare for plastering by adding the key (that part of the plastering which is forced through between the laths and holds the rest in place).
To provide an arch with a keystone.
Clipping of chromakey.

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A key objective of the group was the union of art and the people.