key detail definition
Definition of KEY. 1. a: a usually metal instrument by which the bolt of a lock is turned b: any of various devices having the form or function of such a key.2. a: a means of gaining or preventing entrance, possession, or control b: an instrumental or deciding factor.3.. a: a usually metal instrument by which the bolt of a lock is turned b: any of various devices having the form or function of such a key. 2. a: a means of gaining or preventing entrance, possession, or control b: an instrumental or deciding factor. 3.