A flight or series of flights of steps and a supporting structure connecting separate levels. Also called stairway.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "staircase" in a sentence
"At the top of the staircase is a small landing that separates two bedrooms to the right and left."
"Under the staircase is a little roome for a butler, thence the staires to the Cellars; this is between the back staires wch are very good and light, and wanscoated up to the garrets, and the great staires wch are very handsome painted white, the Rooffe an oval of Cupids."
"Knight Frank One of the bedroom suites is in the tower, accessed via a staircase from the first floor."