stairway

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stairway

a means of access consisting of stairs; staircase or flight of steps
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

stairway

[′ster‚wā]
(civil engineering)
One or more flights of stairs connected by landings.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

staircase

1. A flight of stairs, or a series of such flights, including supports, handrails, and framework.
2. The structure containing a flight of stairs.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.