Pronunciation

/dɪˈæmɪtər/

Definitions

Noun

• Diameter: A measurement taken across the widest part of a circular or cylindrical object, indicating its size from one side to the other through the center. For example: “The diameter of the Earth is about 12,742 kilometers.”
• Mathematical concept: In geometry, it’s a fundamental property of a circle, defining the distance between two points on its circumference that are exactly opposite each other.

Adjective

• Describing the width or extent of something circular or cylindrical.

Phrases

• “The diameter of the tree trunk is quite large.”
• “A sphere’s volume can be calculated using its diameter and the formula V = (4/3)πr², where r is half the diameter.”
• “The pipe has a small diameter, making it hard to fit through the narrow space.”

Example Sentences

• Noun: “The bridge’s diameter was measured to ensure it could accommodate two lanes.”
• Adjective: “The large-diameter cables support the suspension bridge.”
• Mathematical usage: “To find the area of a circle, you square the diameter and then multiply by π.”

Synonyms

• Radius (when referring to half the measurement)
• Breadth (for the width of a circle)
• Circumference (when discussing the total length around a circle)

Antonyms

• Narrow (for the opposite meaning of wide or broad)