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Merriam-Webster's Collegiate® Dictionary, 11th Edition
I. adverb
Date: 1584
up the stairs ; on or to a higher floor, to or at a high altitude or higher position , in the head ; intellectually ,
II. adjective
Date: 1782
situated above the stairs especially on an upper floor ,
III. noun plural but singular or plural in construction
Date: 1842
the part of a building above the ground floor
