Definition of boundary in US English:

boundary

noun

  • 1A line that marks the limits of an area; a dividing line.

    ‘the eastern boundary of the wilderness’
    ‘the boundary between the US and Canada’
    as modifier ‘a boundary wall’
    • ‘In the picture above, the blue lines mark the boundary of the infected region.’
    • ‘Ropes will be required to mark out the boundary of the area as well as each plot.’
    • ‘There were fields beyond Scots Lane to the north and the cathedral marked the southern boundary.’
    • ‘You know, the neighbors are one meter away, across a river or across a boundary line.’
    • ‘Grey weathered posts, with white ant mounds creeping up around them, mark the boundary.’
    • ‘Nonetheless, the boundary ditches mark a significant moment in the long history of the valley.’
    • ‘The decision to draw the boundary according to county lines made little social, economic, or geographical sense.’
    • ‘As I understand it, not so long ago, Oxford Street marked its northern boundary.’
    • ‘To the west of this is Chile, with the border marking the western boundary of the national park.’
    • ‘A high wooded ridge that runs southward from the mouth of the Orne marked the boundary of the triangle to be held.’
    • ‘Lay a hose or piece of rope on the ground to mark the boundary of your planting area, and plant within it.’
    • ‘A ball of light suddenly appeared on top of the massive wall marking the boundary of the city.’
    • ‘An old stone wall marks the boundary of the plot to one side, while a rocky hill and concrete wall flanks the other.’
    • ‘This street marks the boundary between the old and new districts of the city.’
    • ‘Meandering through the Oxfordshire countryside, the river marks the eastern boundary of the public part of the garden.’
    • ‘Work is going on all this week at the club to bring down the poplars, which line the eastern boundary of the course alongside the first hole.’
    • ‘Accordingly it might well be held to mark the boundary of Australia's continental shelf.’
    • ‘Ten points are agreed as the turning points of the boundary line.’
    • ‘The boundary line for private properties is usually where the sandy area ends and the vegetation begins.’
    • ‘The line came to be regarded as marking the northern boundary of the area where agriculture could be safely pursued.’
    border, frontier, borderline, partition, dividing line, bounding line
    bounds, confines, limits, outer limits, extremities, margins, edges, fringes
    View synonyms
    1. 1.1often boundaries A limit of a subject or sphere of activity.
      ‘a community without class or political boundaries’
      • ‘Russell explains that Bacon sought to blur the boundaries between representation and abstraction.’
      • ‘The list is incomplete, for the boundaries of the subject are steadily expanding.’
      • ‘Secondly, job security has also crossed traditional class boundaries in the last twenty years.’
      • ‘Melancholy is not the only vehicle through which the traditional boundaries between male and female are examined.’
      • ‘There's a place where boys perhaps wisely fear to tread, somewhere where the boundaries of rock and jazz blur.’
      • ‘Drawing on that, the director has cast his Don adrift on the stage, breaking out of the boundaries of the traditional set.’
      • ‘Both governments have pushed the boundaries of political advertising before.’
      • ‘The annihilation of the dinosaurs marks the boundary linking Cretaceous time and Tertiary time.’
      • ‘Wealth also can be important in marking social boundaries in rural areas.’
      • ‘In this way, video game turfs serve to mark boundaries and borders for methods of exploration and play.’
      • ‘That debate cut across all boundaries, be they family, social or political.’
      • ‘If we do away with the old subject boundaries and hierarchies and exams we open places of education up to people of all ages, all abilities.’
      • ‘The issue of global warming is one that cuts across all political and social boundaries.’
      • ‘Networks may cut across social class boundaries and they may also reveal differences within social classes.’
      • ‘What I study does not fit into the traditional boundaries of sociological knowledge.’
      • ‘Globalization studies is emerging as a new field that cuts across traditional disciplinary boundaries.’
      • ‘Using indigenous and interesting sounds we are constantly prodding at the boundaries of rock and roll.’
      • ‘While the jet set rule the grounds, genuine golf lovers cut across class boundaries.’
      • ‘We have eliminated traditional boundaries and made the proposition much clearer for shoppers.’
      • ‘It does not encourage drawing those sorts of abstract internal boundaries.’
      dividing line, divide, division, borderline, demarcation line, line of demarcation, cut-off point, threshold
      limits, parameters, bounds, outer limits, confines, extremities, barriers, thresholds
      View synonyms

Origin

Early 17th century: variant of dialect bounder, from bound + -er, perhaps on the pattern of limitary.

Pronunciation

boundary

/ˈbaʊnd(ə)ri//ˈbound(ə)rē/