Englishfor English speakers
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.
relation
Noun
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A relation is the way two things are towards each other or in comparison with each other.
This building looks too big in relation to the size of the houses on the street.
The children sitting in the boat were moving in relation to their parents who were sitting on the shore because the boat was going away from shore.
There is a relation between eating good food and being healthy.
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A relation is a member of ones' family.
I have an uncle, two aunts and three cousins but no other relations.
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A relation is a statement of equality between two products of generators that are used when showing a group.