Definition of riser
1
: one that rises (as from sleep)
2
: the upright member between two stair treads
3
: a stage platform on which performers are placed for greater visibility
4
: a vertical pipe (as for water or gas) or a vertical portion of an electric wiring system
5
: one of the straps that connects a parachutist's harness with the shroud lines
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Merriam-Webster unabridged
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Time Traveler for riser
The first known use of riser was in the 15th century
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