Webster's English Dictionary

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riding

1. ri.ding \'ri-d-in\ n [ME, alter. of (assumed) OE thriding, fr. ON 
   thrithjungr third part], fr. thrithi third; akin to OE thridda third - more 
   at THIRD 1: one of the three administrative jurisdictions into which 
   Yorkshire, Engl and, is divided 2: an administrative jurisdiction or 
   electoral district in a British domini on (as Canada)
2. rid.ing \'ri-d-in\ n : the act or state of one that rides 
3. rid.ing aj 1: used for or when riding {~ horse}  2: operated by a rider 
   {~ plow}