landmark
US /ˈlænd.mɑːrk/
UK /ˈlænd.mɑːrk/
1.
an object or feature of a landscape or town that is easily seen and recognized from a distance and can be used as a guide
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The Eiffel Tower is a famous landmark in Paris.
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We used the old oak tree as a landmark to find our way back.
2.
an event or discovery marking an important stage or turning point in something
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The discovery of penicillin was a landmark in medicine.
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This new policy represents a landmark decision for the company.
1.
marking an important stage or turning point
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It was a landmark decision in the history of civil rights.
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The court case set a landmark precedent.