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staircase

[stair-keys] /ˈstɛərˌkeɪs/
noun
1.
a flight of stairs with its framework, banisters, etc., or a series of such flights.
Origin
1615-1625
1615-25; stair + case2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for stair-case

staircase

/ˈstɛəˌkeɪs/
noun
1.
a flight of stairs, its supporting framework, and, usually, a handrail or banisters
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for stair-case

staircase

n.

also stair-case, 1620s, originally the enclosure of the stairs, from stair + case (n.2) in its sense "frame;" e.g. former window-case, door-case.

Online Etymology Dictionary, © 2010 Douglas Harper
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stair-case in Medicine

staircase stair·case (stâr'kās')
n.
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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5
5
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