Meaning & Definition of word "Radius"

Radius

/ˈreɪdiəs/

noun:

  • 1. A straight line from the center to the circumference of a circle or sphere.
    • Example: The radius of the circle is 5 centimeters.
  • 2. The length of such a line.
    • Example: To find the area of the circle, you need to calculate the radius.
  • 3. A circle or sphere having a specified radius.
    • Example: The design included a radius of 10 meters around the central fountain.

verb:

  • 1. To extend or measure out in radius.
    • Example: They decided to radius the search area to maintain efficiency.

Etymology

Latin 'radius' meaning 'spoke of a wheel' or 'ray of light'.

Common Phrases and Expressions

radius of action:

The area in which influence or activity occurs.

within a radius:

In proximity to a specified distance.

radius of influence:

The area in which one has power or ability to affect.

Related Words

diameter:

A straight line passing from side to side through the center of a figure, especially a circle.

circumference:

The enclosing boundary of a curved geometric figure, especially a circle.

arc:

A part of the circumference of a circle.

Slang Meanings of radius