Definition of boundary in English:


nounPlural boundaries

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

    ‘a county boundary’
    ‘the river marks the boundary between the two regions’
    as modifier ‘a boundary wall’
    • ‘Lay a hose or piece of rope on the ground to mark the boundary of your planting area, and plant within it.’
    • ‘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.’
    • ‘The boundary line for private properties is usually where the sandy area ends and the vegetation begins.’
    • ‘Ropes will be required to mark out the boundary of the area as well as each plot.’
    • ‘A ball of light suddenly appeared on top of the massive wall marking the boundary of the city.’
    • ‘Ten points are agreed as the turning points of the boundary line.’
    • ‘The line came to be regarded as marking the northern boundary of the area where agriculture could be safely pursued.’
    • ‘Meandering through the Oxfordshire countryside, the river marks the eastern boundary of the public part of the garden.’
    • ‘Nonetheless, the boundary ditches mark a significant moment in the long history of the valley.’
    • ‘Accordingly it might well be held to mark the boundary of Australia's continental shelf.’
    • ‘There were fields beyond Scots Lane to the north and the cathedral marked the southern boundary.’
    • ‘An old stone wall marks the boundary of the plot to one side, while a rocky hill and concrete wall flanks the other.’
    • ‘A high wooded ridge that runs southward from the mouth of the Orne marked the boundary of the triangle to be held.’
    • ‘This street marks the boundary between the old and new districts of the city.’
    • ‘Grey weathered posts, with white ant mounds creeping up around them, mark the boundary.’
    • ‘In the picture above, the blue lines mark the boundary of the infected region.’
    • ‘As I understand it, not so long ago, Oxford Street marked its northern boundary.’
    • ‘The decision to draw the boundary according to county lines made little social, economic, or geographical sense.’
    • ‘You know, the neighbors are one meter away, across a river or across a boundary line.’
    • ‘To the west of this is Chile, with the border marking the western boundary of the national park.’
    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 something abstract, especially a subject or sphere of activity.
      ‘a community without class or political boundaries’
      • ‘It does not encourage drawing those sorts of abstract internal boundaries.’
      • ‘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.’
      • ‘Globalization studies is emerging as a new field that cuts across traditional disciplinary boundaries.’
      • ‘Russell explains that Bacon sought to blur the boundaries between representation and abstraction.’
      • ‘Secondly, job security has also crossed traditional class boundaries in the last twenty years.’
      • ‘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.’
      • ‘While the jet set rule the grounds, genuine golf lovers cut across class boundaries.’
      • ‘Both governments have pushed the boundaries of political advertising before.’
      • ‘The list is incomplete, for the boundaries of the subject are steadily expanding.’
      • ‘What I study does not fit into the traditional boundaries of sociological knowledge.’
      • ‘Networks may cut across social class boundaries and they may also reveal differences within social classes.’
      • ‘The issue of global warming is one that cuts across all political and social boundaries.’
      • ‘Using indigenous and interesting sounds we are constantly prodding at the boundaries of rock and roll.’
      • ‘Drawing on that, the director has cast his Don adrift on the stage, breaking out of the boundaries of the traditional set.’
      • ‘We have eliminated traditional boundaries and made the proposition much clearer for shoppers.’
      • ‘Melancholy is not the only vehicle through which the traditional boundaries between male and female are examined.’
      • ‘That debate cut across all boundaries, be they family, social or political.’
      • ‘In this way, video game turfs serve to mark boundaries and borders for methods of exploration and play.’
      • ‘There's a place where boys perhaps wisely fear to tread, somewhere where the boundaries of rock and jazz blur.’
      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
  • 2Cricket
    A hit crossing the limits of the field, scoring four or six runs.

    • ‘Neil Fairbrother also looked in good form, hitting Brown for four boundaries until he went caught and bowled.’
    • ‘Both were aggressive during their stand, scoring in boundaries that did not stop even when the spinners came on to stem the flow of runs.’
    • ‘Flower was hardly troubled by the bowling, creaming boundaries through the off side and running the singles hard.’
    • ‘There was a century for the taking, but he refused to think about that, constantly looking to innovate and score boundaries.’
    • ‘Then he could score a few boundaries early on and the pressure would be off him.’
    • ‘He struck five hefty boundaries, including three successive fours.’
    • ‘Hayden then plays and misses, before scoring a lucky boundary off his thigh-pad.’
    • ‘After two boundaries he was caught behind off Friedlander and the students felt they could make further inroads.’
    • ‘Nasser Hussain announced himself with a majestic cover drive for a boundary.’
    • ‘What's the highest score anyone has made in a first-class match entirely in boundaries?’
    • ‘Lehmann suppressed his natural attacking game and it was not until his 20th over at the crease that he scored his first boundary.’
    • ‘Harvey had faced 45 balls, plundering eight fours and three sixes, and no-one else had scored a boundary.’
    • ‘Both struck four boundaries apiece and hustled the singles with a great deal of urgency.’
    • ‘When he stroked a cover-drive to the fence, one of six boundaries, we realised that he had overcome the pain.’
    • ‘Scott Styris cashed in too, quite literally - picking off boundaries through and over midwicket at will.’
    • ‘I seemed to score a lot of boundaries and it doesn't always happen that way.’
    • ‘Fleming broke the shackles with four handsome off-driven boundaries in the space of two overs.’
    • ‘Though never at his best, Crawley still managed four boundaries in his 36 off 81 balls.’
    • ‘Weston went briefly on the rampage, hitting four boundaries in two overs, before settling down again.’
    • ‘His 49 took 71 balls with only three boundaries after a glorious cover drive to the first ball he faced.’


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