Englishfor English speakers
possibility
Noun
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If there is a possibility of something, it might happen or it might be true.
There is a real possibility of war.
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The possibility of something is how possible it is.
There is a strong possibility of rain today.
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
principle
Noun
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Principles are personal rules that tell you what is right and wrong.
It goes against my principles to ignore her.
One principle I follow is not to have regret.
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A principle is the general idea that explains or supports something.
The basic principle of his chair is that the knees should be below the hips.
Police must not accept money because it could affect their judgement. The same principle applies if gifts, etc, are offered.