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land‧mark [countable]
1 something that is easy to recognize, such as a tall tree or building, and that helps you know where you are:
One of Belfast's most famous landmarks, the Grosvenor Hall, has been demolished.
2 one of the most important events, changes, or discoveries that influences someone or something:
The discovery of penicillin was a landmark in the history of medicine.
landmark decision/case/ruling
The Supreme Court issued a landmark decision in January 2001.

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