I. riding noun
Date: 14th century
: the action or state of one that rides
II. riding adjective
Date: 15th century
1. : used for or when riding
a riding horse
riding boots
2. : operated by a rider
a riding mower
III. ri·ding ˈrī-diŋ noun
Etymology: Middle English -redying or trithing, alteration of Old English * thriding, from Old Norse thrithjungr third part, from thrithi third; akin to Old English thridda third — more at third
Date: 15th century
1. : one of the three administrative jurisdictions into which Yorkshire, England, was formerly divided
2. : an administrative jurisdiction or electoral district in a British dominion (as Canada)