Englishfor English speakers
idea
Noun
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An idea is a concept or a thought.
It was a good idea.
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An idea is something abstract (not concrete).
Love is just an idea.
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An idea is a way to see something, a view.
He changed her ideas on religion.
advertisement
Noun
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An advertisement is a public notice which advertises something; pictures and writing from a company which many people can see.
There was an advertisement for fruit on the wall. It had a big picture of an apple.