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Meaning of final frontier in English:

final frontier

noun

  • 1A part of a country, region, etc. that is the last to be settled, explored, or developed.

    • ‘ the final frontier was Antarctica’
    1. 1.1The extreme limit of understanding or achievement in a particular area.
      • ‘the artist stands on the final frontier of the hip-hop universe’

Origin

Mid 19th century popularized by its use in the opening of the US television series Star Trek.