| NOUN | shape | straight line | a line traced by a point traveling in a constant direction |
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| 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" | |
| Narrower | asymptote | A straight line that is the limiting value of a curve |
| 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 |
| Opposite | curve, curved shape | The trace of a point whose direction of motion changes |
| Spanish | recta | |
| Catalan | recta | |
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