| 单词 | frontier |
| 释义 | Word Frequency frontier(ˈfrʌntɪə, frʌnˈtɪə) noun 1. a. the region of a country bordering on another or a line, barrier, etc, marking such a boundary b. (as modifier) a frontier post 2. US and Canadian a. the edge of the settled area of a country b. (as modifier) the frontier spirit 3. (often plural) the limit of knowledge in a particular field the frontiers of physics have been pushed back Word origin C14: from Old French frontiere, from front (in the sense: part which is opposite); see front |
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