To see Multiple Meanings of
frontier
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Multiple Meanings
frontier — as in:  the frontier of Tibet

Indian soldiers and technicians assisted in staffing some of the checkposts on the frontier with Tibet.
an international boundary or a wilderness at the edge of a settled area
frontier — as in:  the frontier of brain science

She wants to extend the frontiers of voice-controlled computer applications.
the most recent understandings and achievements in a changing field
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