a flight of stairs with its framework, banisters, etc., or a series of such flights.

1615–25; stair + case2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
staircase (ˈstɛəˌkeɪs)
a flight of stairs, its supporting framework, and, usually, a handrail or banisters

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1660s, from stair + case (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

staircase stair·case (stâr'kās')
A series of reactions or responses that follow one another in progressively increasing or decreasing intensity, so that a chart shows a continuous rise or fall.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

staircase definition


The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Think of a long staircase and there is a line of people at the top, each
  representing an instruction.
On the return walk down the other side of the garden, a lovely stone staircase
  swings you down into a lower patio.
To complement the new seat wall, the old staircase was rebuilt and resurfaced.
To reach a newly accessible cove, head down the staircase near the entrance.
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