subtend: meaning, definition, pronunciation and examples
Low FrequencyTechnical, Academic, Scientific
Quick answer
What does “subtend” mean?
(In geometry) to be opposite and mark the limits of (an arc or angle). (In botany) to extend under or be adjacent to (another structure).
Audio
Pronunciation
Definition
Meaning and Definition
(In geometry) to be opposite and mark the limits of (an arc or angle). (In botany) to extend under or be adjacent to (another structure).
To form or delimit a boundary or underlying relationship. In general use, it can mean to underlie or form the basis for something, often an abstract concept.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage between BrE and AmE. It is a technical term used identically in both varieties.
Connotations
None beyond its precise, technical definition.
Frequency
Equally rare in both varieties, confined to specific technical fields.
Grammar
How to Use “subtend” in a Sentence
[Line/Chord] subtends [angle/arc] at [point][Structure] subtends [another structure]Vocabulary
Collocations
Examples
Examples of “subtend” in a Sentence
verb
British English
- The chord subtends a right angle at the centre of the circle.
- The bract subtends the flower in this species.
American English
- In this diagram, line AB subtends angle ACB.
- The leaf subtends the axillary bud.
adverb
British English
- The arc was positioned subtendingly.
- None in common use.
American English
- None in common use.
- None in common use.
adjective
British English
- The subtending line was clearly marked.
- A subtending bract is present.
American English
- Measure the subtended angle carefully.
- Observe the subtending leaf structure.
Usage
Meaning in Context
Business
Not used.
Academic
Used in mathematics, geometry, botany, and sometimes philosophy/linguistics in a metaphorical sense (e.g., 'a concept subtended by cultural assumptions').
Everyday
Virtually never used.
Technical
Primary domain. Precise use in geometry and botany.
Watch out
Common Mistakes When Using “subtend”
- Using it as a synonym for 'extend' or 'subtract'.
- Using it in everyday contexts where simpler words like 'underlie' or 'form' are appropriate.
FAQ
Frequently Asked Questions
No, it is a low-frequency technical term used primarily in mathematics (geometry) and botany.
It would sound very unusual and overly technical. Words like 'underlie', 'form', or 'be opposite to' are used instead in general contexts.
Confusing it with 'subtract' due to the similar prefix 'sub-'. Their meanings are completely unrelated.
No, its meaning is identical and equally technical in both varieties of English.
(In geometry) to be opposite and mark the limits of (an arc or angle). (In botany) to extend under or be adjacent to (another structure).
Subtend is usually technical, academic, scientific in register.
Subtend: in British English it is pronounced /səbˈtɛnd/, and in American English it is pronounced /səbˈtɛnd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Think of a SUBmarine that TENDs to go UNDER something. 'Subtend' often means a line is UNDER or opposite an angle.
Conceptual Metaphor
UNDERLYING STRUCTURE / OPPOSITE BOUNDARY
Practice
Quiz
In which field is the term 'subtend' most precisely and commonly used?