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The word straight means something that goes in one direction without turns, bends, or curves.

Lines can bend in a curve. If lines do not bend, they are straight. For example, the edge of a circle is not straight. The edge of a circle bends in a curve.

Light bends in a curve in air and water, but travels in a straight line away from the earth or other bodies in outer space where there is no air. The word "straight" is also a slang term for "heterosexual"

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