Key smart checking ® everyday checking with everything you need. The meaning of key is a usually metal instrument that is used to open a lock or to start or access a mechanism. How to use key in a sentence.
The key element of the thesis. See examples of key used in a sentence. A key is a specially shaped piece of metal that you place in a lock and turn in order to open or lock a door, or to start or stop the engine of a vehicle.
They put the key in the door and entered. The usual type of key is a small metal object that you insert into a narrow opening and turn. With key’s online banking and mobile app, you can bank without going to the bank — and make what might be a busy day, a little less busy.
Definition of key noun in oxford advanced learner's dictionary.
