1a person who is riding or who can ride a horse, bicycle, motorcycle, etc.:two riders approached the cottageshe was a skilled rider
2a condition or proviso added to something already agreed:one rider to the deal—if the hurricane heads north, we run for shelter
British an addition or amendment to a bill at its third reading.
British a recommendation or comment added by the jury to a judicial verdict:a rider was also added: the question of liability was dependent upon the purpose of the disclosure
a supplementary clause in a performer’s contract specifying food, drink, etc., to be provided.
3a small weight positioned on the beam of a balance for fine adjustment.
Derivatives
riderless
adjective
Origin:
late Old Englishrīdere 'mounted warrior, knight' (see ride, -er1)