- metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
- something crucial for explaining
- pitch of the voice
- any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music
💬 Examples
- "the key to development is economic integration"
- "he spoke in a low key"
- "they were carrying two keys of heroin"
- "the poem was later set to music and entitled `The Star-Spangled Banner' (1779-1843)"