Frontier

A frontier is the line or area where our known world ends and wild, unexplored land begins, like the edge of your neighborhood before you get to a big, mysterious forest.

Examples

• The explorers traveled to the frontier to discover new lands and meet interesting animals.
• In science class, we learned about the frontier of space and the planets beyond Earth.
• My grandpa told me stories about the frontier when people were settling in the wild West.

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Antonyms