A platform between flights of stairs or at the termination of a flight of stairs.
Merriam-Webster Online Dictionarylanding (noun)
an act or process of one that - lands , especially a going or bringing to a surface (as land or shore) after a voyage or flight
a place for discharging and taking on passengers and cargo
a level part of a staircase (as at the end of a flight of stairs)
the amount of fish or shellfish annually in a particular area - landed
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Landing is the last part of a flight, where a flying animal, aircraft, or spacecraft returns to the ground. When the flying object returns to water, the process is called alighting, although it is commonly called "landing", "touchdown" or "splashdown" as well. A normal aircraft flight would include several parts of flight including taxi, takeoff, climb, cruise, descent and landing.