The word key usually means something that opens, unlocks, or gives access to something else. It can be a physical object, like a house key, or it can mean something important, like the key point in a conversation.
People use key in daily life in many ways. For example, you use a key to open a door, but you can also say something is key when it is very important, such as a key idea, key person, or key reason.
Meaning & Usage
Key can mean an object that opens a lock, or it can describe something that is essential and important. In everyday English, people often use it to talk about the main thing that matters most.
Examples
“I lost my house key.”
“Trust is key in a good relationship.”
“This is the key point in the discussion.”
Context / Common Use
You will hear key used in homes, offices, school, work, and conversations. It is a very common word in both literal and figurative meaning.
What does key mean in simple English?
It usually means something that opens a lock or something very important.
How is key used in a sentence?
People use it for real objects, like a door key, and for important ideas, like a key reason.
Is key a noun and an adjective?
Yes. It can be a noun, like “a key,” or an adjective, like “a key issue.”
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