circumference
- 01 B2 Upper Intermediate
the total length of the outside edge of a circle or round shape.
the linear distance around the edge of a closed curve or circular object.
Simple“The scientist measured the circumference of the tree trunk to estimate its age.”
In context“To calculate the circumference of the planet at the equator, early astronomers relied on precise observations of the sun's angle at different latitudes.”
UsageUsually functions as a countable noun; often used with the preposition 'of'.
- 02 B2 Upper Intermediate
the actual line that forms the edge of a circle.
the set of points that constitute the boundary of a circle or similar geometric figure.
Simple“He drew a series of small dots along the circumference of the circle.”
In context“The architect designed the walkway to follow the circumference of the courtyard, creating a perfect loop for visitors.”
“Abdominal obesity was defined as a waist circumference greater than 102 centimeters for men and 88 centimeters for women.”
“Even when used on its own, waist circumference performed nearly as well.”
From Latin circumferentia, from circum (“around”) + ferō (“I carry”). Displaced native Old English ymbgang.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.