first floor

noun
1.
the ground floor of a building.
2.
the floor above the ground floor of a building.

Origin:
1655–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
first floor
 
n
1.  (Brit) US and Canadian term: second floor the floor or storey of a building immediately above the ground floor
2.  (US), (Canadian) another term for ground floor

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They adapted by having squares flood, by having stairs under water by having
  the first floor of many buildings flood.
The dog runs ahead up the stairs to first floor and stops at the door to the
  right.
On the first floor, an oval-shaped structure with translucent walls houses the
  ticket office and a concession stand.
Some model trains and other miscellaneous displays filled up the first floor.
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