Webster's English Dictionary

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stair

stair \'sta(*)r, 'ste(*)r\ n [ME steir, fr. OE st-ger; akin to OE & 
   OHG sti-ga]n to rise, Gk steichein to walk 1: a series of steps or flights 
   of steps for passing from one level to anot her 2: any one step of a 
   stairway  pl but sing in constr  3: a flight of steps : STAIRWAY