Webster's English Dictionary

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rider

rid.er \'ri-d-*r\ \-l*s\ n 1: one that rides  2a: an addition to a document 
   often attached on a separate piece of paper  2b: a clause appended to a 
   legislative bill to secure a usu. distinct objec t 3: something used to 
   overlie another or to move along on another piece  - rid.er.less aj