Meaning of the word frontier in English

What does frontier mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

frontier

US /frʌnˈtɪr/
UK /ˈfrʌn.tɪər/

Noun

1.

a line or border separating two countries

Example:
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The soldiers guarded the frontier between the two nations.
•
They crossed the frontier illegally.
2.

the extreme limit of settled land beyond which lies wilderness, especially in reference to the western US before the 20th century

Example:
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Pioneers ventured into the vast American frontier.
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Life on the frontier was harsh and challenging.
3.

the extreme limit of understanding or achievement in an area of knowledge or endeavor

Example:
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Space exploration represents the ultimate frontier of human endeavor.
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Scientists are pushing the frontiers of medical knowledge.