Englishfor English speakers
beyond
Preposition
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If mathx/math is beyond mathy/math, it is on the far side of mathy/math.
He went beyond the mountains, into the woods.
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
frontier
Noun
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The frontier is part of a country that is next to another country.
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A frontier is an area where few or no people live.
Many settlers were killed on the frontier during colonial days in America.
Outer space is said to be the last frontier.