Definition of boundary noun from the Oxford Advanced Learner's Dictionary

     

    boundary

     noun
    noun
    BrE BrE//ˈbaʊndri//
     
    ; NAmE NAmE//ˈbaʊndri//
     
    (pl. boundaries) Cricket
     
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  1. 1a real or imagined line that marks the limits or edges of something and separates it from other things or places; a dividing line national boundaries (British English) county boundaries boundary changes/disputes The fence marks the boundary between my property and hers. Scientists continue to push back the boundaries of human knowledge. the boundary between acceptable and unacceptable behaviour He could just see her beyond the boundary wall of the cemetery. to extend the boundaries of high art to include some popular music Synonymsborderboundary frontierThese are all words for a line that marks the edge of something and separates it from other areas or things.border the line that separates two countries or areas; the land near this line:a national park on the border between Kenya and Tanzaniaboundary a line that marks the edges of an area of land and separates it from other areas:The fence marked the boundary between my property and hers.frontier (British English) the line that separates two countries or areas; the land near this line:The river formed the frontier between the land of the Saxons and that of the Danes.which word?The point where you cross from one country to another is usually called the border. In British English it can also be called the frontier, but this is often in a context of wildness, danger and uncertainty:The rebels control the frontier and the surrounding area. The line on a map that shows the border of a country can be called the boundary but ‘boundary’ is not used when you cross from one country to another:After the war the national boundaries were redrawn. Thousands of immigrants cross the boundary every day. Boundary can also be a physical line between two places, for example between property belonging to two different people, marked by a fence or wall:the boundary fence/​wall between the propertiesPatterns across/​along/​on/​over a/​the border/​boundary/​frontier at the boundary/​frontier the border/​boundary/​frontier with a place the northern/​southern/​eastern/​western border/​boundary/​frontier a national/​common/​disputed border/​boundary/​frontier
  2. 2(in cricket) a hit of the ball that crosses the boundary of the playing area and scores extra points He hit 13 boundaries from 183 balls. See related entries: Cricket
  3. Word Origin early 17th cent.: variant of dialect bounder, from bound ‘boundary’ + -er, perhaps on the pattern of limitary.Extra examples His policies appeal across party political boundaries. In her performance she had clearly overstepped the boundaries of good taste. She had never strayed beyond the city boundaries. The Internet has blurred the boundary between news and entertainment. The boundary was fixed just south of the farm. The river forms the boundary. The state has a boundary with Ontario. They drove across the boundary. This goes beyond the boundaries of what is accepted. This job crosses the traditional boundary between social work and health care. We continued along the southern boundary of the county. We had to stop at the boundary. We’ve just crossed the boundary into Sussex. a boundary dispute between Brazil and Paraguay a boundary dispute with their neighbours keeping within the boundaries of the law on the boundary of physics and chemistry research which extends the boundaries of human knowledge the boundary between Sussex and Surrey the boundary between sanity and insanity within the boundaries of the old city walls After the war the national boundaries were redrawn. It is up to the teacher to set the boundary between acceptable and unacceptable behaviour. Our aim is to extend the boundaries of high art to include some popular music. The fence marked the boundary between my property and hers. Three settlers were killed in a boundary dispute last week.
See the Oxford Advanced American Dictionary entry: boundary

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