semicircle: meaning, definition, pronunciation and examples
B2Formal/Neutral
Quick answer
What does “semicircle” mean?
A half of a circle.
Audio
Pronunciation
Definition
Meaning and Definition
A half of a circle; a shape or object forming an arc of 180 degrees.
A group of people or objects arranged in a half-circle shape; a period of time regarded as half of a complete cycle.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is identical. Pronunciation differs slightly.
Connotations
None.
Frequency
Equally common in both varieties in mathematical, architectural, and general descriptive contexts.
Grammar
How to Use “semicircle” in a Sentence
The children sat in a semicircle.A semicircle of stones marked the ancient site.It forms a perfect semicircle.Vocabulary
Collocations
Examples
Examples of “semicircle” in a Sentence
adjective
British English
- The semicircular window provided a unique view.
- They used a semicircular arrangement.
American English
- The semicircular driveway looped in front of the house.
- We sat at a semicircular table.
Usage
Meaning in Context
Business
Rare. Might be used in design or layout discussions (e.g., 'a semicircle conference table').
Academic
Common in mathematics, geometry, history (e.g., describing megalithic structures), and theatre (stage positioning).
Everyday
Used to describe the arrangement of people or objects.
Technical
Standard term in geometry and drafting.
Vocabulary
Synonyms of “semicircle”
Vocabulary
Antonyms of “semicircle”
Watch out
Common Mistakes When Using “semicircle”
- Misspelling as 'semi-circle' (hyphenated form is less common in modern usage).
- Using 'semicircle' to describe a shape that is not a precise 180-degree arc.
FAQ
Frequently Asked Questions
'Semicircle' is the general, more common term. 'Hemicycle' is a more formal or technical term, often used in architecture (e.g., for a semicircular room) or to describe certain legislative chamber layouts.
No, 'semicircle' is exclusively a noun. The related adjective is 'semicircular'.
The unhyphenated form 'semicircle' is standard in modern English, though the hyphenated form is occasionally seen and is not incorrect, just less common.
The area of a semicircle is half the area of a full circle with the same radius: (πr²)/2, where 'r' is the radius.
A half of a circle.
Semicircle is usually formal/neutral in register.
Semicircle: in British English it is pronounced /ˈsemiˌsɜːkl/, and in American English it is pronounced /ˈsemiˌsɜːrkl/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “No common idioms”
Learning
Memory Aids
Mnemonic
Think 'SEMI-final' (half of the final) + 'CIRCLE' = half of a circle.
Conceptual Metaphor
HALF IS A SEMICIRCLE (e.g., 'The audience formed a semicircle around the speaker' metaphorically maps the concept of 'half' onto a social arrangement).
Practice
Quiz
In geometry, a semicircle is defined as: