Meaning | A line traced by a point traveling in a constant direction; a line of zero curvature. |
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Example | "the shortest distance between two points is a *straight line*" |
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Narrower | asymptote | A straight line that is the limiting value of a curve |
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chord | A straight line connecting two points on a curve |

diagonal, bias | A line or cut across a fabric that is not at right angles to a side of the fabric |

diagonal | (geometry) a straight line connecting any two vertices of a polygon that are not adjacent |

diameter | A straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface) |

element | A straight line that generates a cylinder or cone |

perpendicular | A straight line at right angles to another line |

radius | A straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) |

secant | A straight line that intersects a curve at two or more points |

tangent | A straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point |

vector | A straight line segment whose length is magnitude and whose orientation in space is direction |

Broader | line | A length (straight or curved) without breadth or thickness |
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Opposite | curve, curved shape | The trace of a point whose direction of motion changes |
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Spanish | recta |
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Catalan | recta |
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