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A prominent identifying feature of a landscape.
(noun)
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A fixed marker, such as a concrete block, that indicates a boundary line.
(noun)
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An event marking an important stage of development or a turning point in history.
(noun)
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A building or site with historical significance, especially one marked for preservation by a municipal or national government.
(noun)
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Having great import or significance: a landmark court ruling.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.