frontier

language: en

definitions

  1. noun
    a border region between two countries or areas; the edge of known territory
    en: a border region between two countries or areas; the edge of known territory
  2. noun
    the state of being at the edge of knowledge or experience; pioneering
    en: the state of being at the edge of knowledge or experience; pioneering

examples

  1. the American frontier

    the American frontier

  2. on the frontier of science

    on the frontier of science