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Definition of riser
1 [with adjective] a person who habitually gets out of bed at a particular time of the morning:late risers always exasperate early risers
2a vertical section between the treads of a staircase. 3a vertical pipe for the upward flow of liquid or gas. 4a low platform on a stage or in an auditorium, used to give greater prominence to a speaker or performer. 5a strip of webbing joining the harness and the rigging lines of a parachute or paraglider.