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boundary

BOWN-duh-ree /ˈbaʊndri/

nounB2SATACTIELTS

generalpsychologicalgeographical

A line that marks the limits of an area; a dividing line; a limit of what is acceptable or allowed.

Can be physical (a fence, a closed door) or psychological/interpersonal (personal space, emotional limits).

The story behind the word. The word comes from the Old French 'bodne', which referred to a landmark or boundary stone used to divide fields. It evolved into 'bound' and eventually 'boundary', retaining the sense of a marked limit.

Word relationships

limit: 'Limit' is a point beyond which something cannot go; 'boundary' is the actual dividing line that separates two spaces or domains.
border: 'Border' is specifically used for geographic and political divisions (e.g., country borders), while 'boundary' is broader and highly psychological.

Commonly confused with

barrier: A 'barrier' is an obstacle that physically blocks passage; a 'boundary' simply defines where one space ends and another begins.

Word family

bound (noun/verb): A limit; to form a boundary.
boundless (adjective): Having no limits; infinite.

Collocations

set boundaries
respect boundaries
clear boundary
boundary line

Idioms & expressions

push the boundaries

Example sentences

"Establishing a clear boundary regarding personal food prevents arguments in a shared kitchen." Setting roommate expectations
"The river forms a natural boundary between the two properties." Geographical limit

Memory hook

A boundary keeps you 'bound' within your own territory. Boundary: Keeps you bound to your space.

When not to use

Do not use when referring to a physical barrier meant to block entry entirely, like a thick brick wall (use 'barrier' or 'wall').

Fun facts

In psychology, 'boundary work' refers to the daily strategies people use to separate their professional lives from their personal lives, especially when working from home.