Englishfor English speakers
expansion
Noun
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The act or process of expanding.
The expansion of metals and plastics in response to heat is well understood.
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A new addition.
My new office is in the expansion behind the main building.
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A product to be used with a previous product.
This expansion requires the original game-board.
angle
Noun
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When two straight lines come together, they make an angle.
A 90° angle is called a right angle.