an approach to or sighting of land: The ship will make its landfall at noon tomorrow.
the land sighted or reached.
a landslide.

1620–30; land + fall Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
landfall (ˈlændˌfɔːl)
1.  the act of sighting or nearing land, esp from the sea
2.  the land sighted or neared

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"sighting of land," 1620s, from land (v.1) + fall (v.) in the sense of "happen."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Alaskans are awaiting the landfall of a storm that may end larger than any on
  record in the area.
Dispersing the oil is considered one of the best ways to protect birds and keep
  the slick from making landfall.
As you might imagine, communication is important as the hurricane is
  approaching and making landfall.
In those areas where oil has already made landfall, cleanup workers continue to
  slog away.
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