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frontier - definition and synonyms


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noun frontier pronunciation in American English /frʌnˈtɪr/
Word Forms
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  1. 1
    [countable] a border between two countries, especially one with official points where people or vehicles cross
    frontier between: the frontier between Israel and Lebanon
    frontier with: Italy’s frontier with Switzerland
    on/at the frontier: troops massing at the frontier
    1. c.
      [only before noun] on or relating to a frontier
      frontier controls
      a frontier town
      frontier post (=official place for crossing): Armed police manned the frontier post.
  2. 2
    [countable] [usually plural] the most advanced or recent ideas about something
    the frontiers of knowledge/science/technology: Their work was on the frontiers of science.
    extend/push back the frontiers (=discover more): We are dedicated to experimentation, to pushing back the frontiers.


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