Etymology
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staircase (n.)

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

updated on November 21, 2013

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Definitions of staircase from WordNet

staircase (n.)
a way of access (upward and downward) consisting of a set of steps;
Synonyms: stairway
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.