American Dictionary

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Definition boundary in American English

boundary noun

[countable] noun
/ˈbaʊnd(ə)ri/

▪ cross, define, establish, extend, overstep, push back

1

something such as a line on a map that marks where one area of land ends and another begins

Example

a proposal to redraw the city boundary to include more land for housing

Example

Akbar extended the boundaries of his empire in the north and south.

Example

Rhode Island shares boundaries with the states of Massachusetts, Connecticut, and New York.

Example

The Una River forms a natural boundary between the two countries.

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2

the limits of an activity or experience

Example

a community in which class boundaries are very clearly drawn

Example

new research that pushes back the boundaries of genetic science

Example

The party's support cuts across religious boundaries (=is not influenced by differences among religions).

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Example

The boundary between fact and fiction in her writing is often blurred.

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3

the outer edge of the playing area in cricket

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Definition boundary in American English