Definitions

1. noun

A slot in a machine or device, especially a lock or a gear, for receiving a key or a key-like object

“The keyway on the old lock was rusty and difficult to turn.”

2. noun

A groove or slot in a machine or mechanism for guiding a moving part, especially a gear

“The keyway on the gear ensured a smooth rotation.”

3. noun

A key or key-like object that fits into a keyway

“The keyway was designed to fit a specific type of key.”