( especially BrE ) ( NAmE usually story ) / ˈstɔːri; NAmE / noun ( pl. stor·eys , NAmE stor·ies )
1.
a level of a building; a floor :
the upper / lower storey of the house
a single-storey / two-storey building
—see also multi-storey
2.
-storeyed ( BrE ) ( NAmE -storied ) (in adjectives) ( of a building ) having the number of levels mentioned :
a four-storeyed building
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WHICH WORD
storey / floor
You use storey ( BrE )/ story ( NAmE ) mainly when you are talking about the number of levels a building has:
a five-storey house
•
The office building is five storeys high.
Floor is used mainly to talk about which particular level in the building someone lives on, goes to, etc.:
His office is on the fifth floor.
· note at floor
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WORD ORIGIN
late Middle English : shortening of Latin historia history, story, a special use in Anglo-Latin , perhaps originally denoting a tier of painted windows or sculptures on the front of a building (representing a historical subject).