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Definition: key


(1) (Qi) See Qi wireless charging.

(2) A keyboard button. See QWERTY keyboard.

(3) A numeric code that is used with an encryption algorithm to encrypt text for security purposes. See key length, key space, cryptography and salt.

(4) An essential field in a database record. See key field and sort key.

(5) Amazon's door entry system for package delivery. See Amazon Key.

(6) A physical generation identification. See keyed.