great circle: meaning, definition, pronunciation and examples
C1Technical / Academic
Quick answer
What does “great circle” mean?
The largest circle that can be drawn on a sphere, where the plane of the circle passes through the sphere's centre.
Audio
Pronunciation
Definition
Meaning and Definition
The largest circle that can be drawn on a sphere, where the plane of the circle passes through the sphere's centre.
In practical terms (e.g., navigation), it refers to the shortest path between two points on the surface of a sphere.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling of related terms may differ (e.g., centre/center).
Connotations
Neutral technical term in both varieties.
Frequency
Equally low-frequency and specialised in both dialects.
Grammar
How to Use “great circle” in a Sentence
The [Aircraft/Ship] + followed + a great circle route + to + [Destination].The + [distance/path] + between + [Point A] + and + [Point B] + is + a great circle.Vocabulary
Collocations
Examples
Examples of “great circle” in a Sentence
adjective
British English
- The pilot calculated the great-circle distance to Tokyo.
American English
- They used a great-circle routing algorithm.
Usage
Meaning in Context
Business
Rare, except in logistics or aviation planning ('Optimising fuel by using great circle routes').
Academic
Common in geography, astronomy, mathematics, and navigation studies.
Everyday
Virtually never used in casual conversation.
Technical
The primary domain of use; precise term in aviation, shipping, geodesy, and spherical geometry.
Vocabulary
Synonyms of “great circle”
Neutral
Weak
Vocabulary
Antonyms of “great circle”
Watch out
Common Mistakes When Using “great circle”
- Using 'great circle' to mean any large circle (e.g., on a flat map).
- Confusing it with 'circle' alone.
- Pronouncing it with strong emphasis on 'great' as in 'excellent'.
FAQ
Frequently Asked Questions
Yes, the equator is a great circle because its plane passes through the centre of the Earth.
A rhumb line (or loxodrome), which is a path of constant bearing and appears as a straight line on a Mercator map, but is usually longer than a great circle route.
Flat maps (like the Mercator projection) distort shapes and distances. The shortest 3D path (great circle) is projected onto this distorted 2D surface, creating a curved line.
Yes, any line of longitude, paired with its opposite meridian (180 degrees away), forms a great circle. However, lines of latitude (except the equator) are not great circles.
The largest circle that can be drawn on a sphere, where the plane of the circle passes through the sphere's centre.
Great circle is usually technical / academic in register.
Great circle: in British English it is pronounced /ˌɡreɪt ˈsɜːkl̩/, and in American English it is pronounced /ˌɡreɪt ˈsɜːrkl̩/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine slicing an orange perfectly in half. The edge of that slice is a 'great circle' because the cut went through the orange's centre, making the biggest possible circle on its peel.
Conceptual Metaphor
A STRING PULLED TIGHT AROUND A GLOBE: Represents the concept of the shortest, most direct path constrained to a spherical surface.
Practice
Quiz
Which of the following is a true statement about a great circle?