The difference between Key and Legend

Key as a noun:

An object designed to open and close a lock.

Key as a noun:

An object designed to fit between two other objects (such as a shaft and a wheel) in a mechanism and maintain their relative orientation.

Key as a noun:

A crucial step or requirement.

Key as a noun:

A guide explaining the symbols or terminology of a map or chart; a legend.

Key as a noun:

A guide to the correct answers of a worksheet or test.

Key as a noun (computing):

One of several small, usually square buttons on a typewriter or computer keyboard, mostly corresponding to text characters.

Key as a noun (music):

One of a number of rectangular moving parts on a piano or musical keyboard, each causing a particular sound or note to be produced.

Key as a noun (music):

One of various levers on a musical instrument used to select notes, such as a lever opening a hole on a woodwind.

Key as a noun (music):

A hierarchical scale of musical notes on which a composition is based.

Key as a noun (figurative):

The general pitch or tone of a sentence or utterance.

Key as a noun (botany):

An indehiscent, one-seeded fruit furnished with a wing, such as the fruit of the ash and maple; a samara.

Key as a noun (historical):

A manual electrical switching device primarily used for the transmission of Morse code.

Key as a noun (cryptography):

A piece of information (e.g. a passphrase) used to encode or decode a message or messages.

Key as a noun (internet):

A password restricting access to an IRC channel.

Key as a noun (databases):

In a relational database, a field used as an index into another table (not necessarily unique).

Key as a noun (computing):

A value that uniquely identifies an entry in a container.

Key as a noun (basketball):

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.

Key as a noun (biology):

A series of logically organized groups of discriminating information which aims to allow the user to correctly identify a taxon.

Key as a noun (architecture):

A piece of wood used as a wedge.

Key as a noun (architecture):

The last board of a floor when laid down.

Key as a noun (masonry):

A keystone.

Key as a noun:

That part of the plastering which is forced through between the laths and holds the rest in place.

Key as a noun (rail transport):

A wooden support for a rail on the bullhead rail system.

Key as a noun:

The degree of roughness, or retention ability of a surface to have applied a liquid such as paint, or glue.

Key as a noun (cartomancy):

The thirty-third card of the Lenormand deck.

Key as a noun (print and film):

The black ink layer, especially in relation to the three color layers of cyan, magenta, and yellow. See also CMYK.

Key as a noun (computer graphics, television):

A color to be masked or made transparent.

Key as an adjective:

Indispensable, supremely important.

Key as an adjective:

Important, salient.

Key as a verb:

To fit (a lock) with a key.

Key as a verb:

To fit (pieces of a mechanical assembly) with a key to maintain the orientation between them.

Key as a verb:

To mark or indicate with a symbol indicating membership in a class.

Key as a verb ([[telegraphy]] and [[radio telegraphy]]):

To depress (a telegraph key).

Key as a verb (radio):

To operate (the transmitter switch of a two-way radio).

Key as a verb (computing):

(more usually to key in) To enter (information) by typing on a keyboard or keypad.

Key as a verb (colloquial):

To vandalize (a car, etc.) by scratching with an implement such as a key.

Key as a verb:

To link (as one might do with a key or legend).

Key as a verb (intransitive, biology, chiefly, taxonomy):

To be identified as a certain taxon when using a key.

Key as a verb:

To fasten or secure firmly; to fasten or tighten with keys or wedges.

Key as a noun:

One of a string of small islands.

Key as a noun:

.

Key as a noun (slang):

.

Legend as a noun:

A unrealistic story depicting past events. A of unknown origin describing but past . A plausible story set in the historical past, but whose is uncertain. A story in which a is to an unlikely degree. A fabricated backstory for a spy, with associated documents and records; a .

Legend as a noun (UK, Irish, Australia, New Zealand, colloquial, slang):

A person related to a legend or legends. A leading in a historical legend. A person with legend-like qualities, such as extraordinary . # A cool, nice or helpful person, especially one who is male.

Legend as a noun:

A key to the symbols and color codes on a map, chart, etc.

Legend as a noun:

An inscription, motto, or title, especially one surrounding the field in a medal or coin, or placed upon a heraldic shield or beneath an engraving or illustration.

Legend as a verb (archaic, transitive):

To tell or narrate; to recount.