Key
Definition
(adj) : Very important.
Example
"(n) : I lost my house key."
"(n) : Honesty is the key to strong relationships."
"(adj) : The key idea in the lesson is to practice every day to improve quickly."
Explanation
A key mainly means something that opens or unlocks something important. It can be a real object or an important idea. A key is first a small metal object used to open or close a lock. For example, he used a key to open the door. It also has a figurative meaning, where a key is an important Idea or thing that helps you achieve something. For example, curiosity, discipline, and consistency are keys to success, meaning these things are important to reach success. As an idea, “key” means something very important, like the key point is to stay calm (the most important point). In music, a key is the set of notes a song uses. These meanings all show that a key helps you open, understand, or reach something important.