Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “frontier”

frontier

noun [C]    /frʌnˈtɪər/
a border between two countries, or (esp. in the past in the US) a border between developed land where white people live and land where Indians live or land that is wild: It was a movie about the hardships of frontier life in the northwest. fig. A frontier is also a border between what is known and what is not known: the frontiers of knowledge
(Definition of frontier noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of frontier

Definitions of “frontier” in other dictionaries

Word of the Day

pump iron

to lift heavy weights for exercise

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More