Definition of riser noun from the Oxford Advanced American Dictionary

riser

noun
/ˈraɪzər/
 
 
1 early/late riser a person who usually gets out of bed early/late in the morning2 (technical) the vertical part between two steps in a set of stairs compare tread3 risers [plural] a set of wide steps that have several levels and are intended for performers to stand onThe chorus went up to the stage and stood on the risers.
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