boundary
B1Neutral to Formal. Used across all registers, but slightly more frequent in formal, academic, and technical contexts.
Definition
Meaning
A line, real or imagined, that marks the limits or edges of something and separates it from other things.
A limit, threshold, or dividing line in abstract contexts (e.g., social rules, personal space, capabilities, fields of knowledge).
Linguistics
Semantic Notes
Primarily a count noun ('the boundaries'). Can be used literally (geographical) or metaphorically (psychological, social). Implies a degree of separation or containment.
Dialectal Variation
British vs American Usage
Differences
Usage is largely identical. Minor spelling variation in related terms (e.g., 'borderline' is one word in both). The term 'boundary' is preferred in cricket (UK) and baseball (US) for the edge of the playing field.
Connotations
Similar connotations of limit, edge, and division in both varieties.
Frequency
Comparably frequent. Possibly slightly higher in UK English in administrative/geographical contexts (e.g., 'local authority boundary').
Vocabulary
Collocations
Grammar
Valency Patterns
across/at/on the ~ (literal)beyond/within the ~ (literal/metaphorical)~ between A and B~ of (e.g., ~ of knowledge)~ with (e.g., ~ with France)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “push the boundaries”
- “overstep the mark/boundary”
- “know no boundaries”
- “beyond the pale (similar concept)”
Usage
Context Usage
Business
Setting boundaries for work-life balance; boundaries of a market or project scope.
Academic
The boundaries of a discipline; theoretical boundaries; a study that crosses disciplinary boundaries.
Everyday
Fence marking the garden boundary; setting personal boundaries with friends.
Technical
Plate tectonic boundary; boundary layer in fluid dynamics; boundary condition in mathematics.
Examples
By Part of Speech
verb
British English
- The wicket was **boundaried** for four runs.
- The new policy clearly **boundaries** the responsibilities.
American English
- He **boundaried** the ball to the wall for a double.
- The contract **boundaries** the scope of work.
adverb
British English
- Not commonly used.
- Not commonly used.
American English
- Not commonly used.
- Not commonly used.
adjective
British English
- A **boundary-less** organisation (rare, hyphenated).
- The **boundary** fence needs repair.
American English
- They promote **boundaryless** collaboration.
- We walked along the **boundary** line.
Examples
By CEFR Level
- The fence is the **boundary** of our garden.
- Please do not cross this **boundary**.
- The river forms a natural **boundary** between the two regions.
- It's important to set clear **boundaries** at work.
- The research pushes the **boundaries** of what we know about quantum physics.
- They are in talks to redraw the electoral **boundaries**.
- Her innovative approach transcended the traditional **boundaries** of the genre.
- The treaty established a maritime **boundary** recognised under international law.
Learning
Memory Aids
Mnemonic
Think of the sound 'BOUND' in 'boundary'. When you are BOUND by ropes, you cannot move beyond a certain limit. A 'boundary' is that limiting line.
Conceptual Metaphor
IDEAS/RELATIONSHIPS ARE TERRITORIES (e.g., 'cross a boundary', 'uncharted territory of thought').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Не переводить как "граница" только в географическом смысле (border).
- "Boundary" часто абстрактное (личные границы).
- "Граница" и "рубеж" могут быть синонимами, но "boundary" не означает "рубеж" в смысле исторической вехи.
Common Mistakes
- Using 'boundary' as an uncountable noun (e.g., 'There is a lot of boundary').
- Confusing 'border' (often political/geographical line) with 'boundary' (any dividing line, often more abstract).
- Misspelling as 'boundery'.
Practice
Quiz
Which of these is the BEST example of using 'boundary' in a metaphorical/abstract sense?
FAQ
Frequently Asked Questions
'Border' is typically used for political/geographical divisions between countries/states. 'Boundary' is broader and can be any dividing line, especially in abstract, personal, or scientific contexts (e.g., personal boundaries, boundary of a property).
Yes, it is almost always countable. You set boundaries (plural) or cross a boundary (singular).
Rarely and informally, usually in sports (e.g., cricket, baseball) meaning to hit a ball to the boundary. It is not standard in general language.
Confusing it with 'border' and using it only in a geographical sense, or using it as an uncountable noun ('a lot of boundary').
Collections
Part of a collection
Relationships
B1 · 49 words · Vocabulary for interpersonal and social connections.