Definition

1. Noun:
   • A geometric concept: A straight line is a one-dimensional figure with infinite length, having no curvature or bends. It is defined as the path traced by a point moving in a constant direction.
   • The shortest path: In Euclidean geometry, the straight line represents the shortest distance between any two points.

Usage Examples

• Noun:
  • Use a ruler to draw a straight line.
  • In geometry, a straight line extends infinitely in both directions.
  • The property was divided by a straight line running north to south.

Advanced Usage

• "in a straight line": Moving or arranged without deviation.
  • Please walk in a straight line to the exit.
• Mathematical Context: Often represented by the linear equation in a Cartesian plane.
  • The graph of the function is a straight line with a slope of 2.

Variants and Related Words

• Linear (adj): Of, relating to, or resembling a line; involving a single dimension.
  • The data showed a linear relationship.
• Line segment (n): A part of a that is bounded by two distinct end points.
  • A line segment connects point A to point B.

Synonyms

• Direct line: The most immediate or undeviating path.
• Beeline: A direct, straight course (often used idiomatically for the most direct route).

Related Phrases

• Straight and narrow: An idiom meaning a morally upright and law-abiding course of life. (Note: This is an idiom, not a geometric term).
  • After his release, he tried to stay on the straight and narrow.

Notes on Meaning

The term straight line is fundamental in mathematics, physics, and engineering. It is an abstract concept representing perfect straightness, which is an idealization not perfectly found in the physical world but used for calculation, design, and theoretical models.

Noun

1. a line traced by a point traveling in a constant direction; a line of zero curvature
   • the shortest distance between two points is a straight line