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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
key
character key
1. A value used to identify a record in a
database, derived by applying some fixed function to the
record. The key is often simply one of the fields (a
column if the database is considered as a table with records
being rows, see "key field"). Alternatively the key may be
obtained by applying some function, e.g. a hash function, to
one or more of the fields. The set of keys for all records
forms an index. Multiple indexes may be built for one
database depending on how it is to be searched.
2. A value which must be fed into the
algorithm used to decode an encrypted message in order to
reproduce the original plain text. Some encryption schemes
use the same (secret) key to encrypt and decrypt a message,
but public key encryption uses a "private" (secret) key and
a "public" key which is known by all parties.
3. An electromechanical keyboard button.
(2003-07-04)