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riser

noun
     
Related topics: Building
ris‧er [countable]
1

early/late riser

someone who usually gets out of bed very early or very late
2 technicalTB the upright part of a step on a set of stairs
3

risers

[plural] American English a set of wooden or metal steps that can be moved from place to place, used for a group of people to stand on:
The school choir stood on risers behind the orchestra.

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