A riding costume, riding horses.
A riding mower.
Origin of riding
- Middle English alteration of trithing from Old English thrithing from Old Norse thridhjungr third part from thridhi third trei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English, from Old English *Ã¾riÃ°ing, from Old Norse Ã¾riÃ°jungr (“third part")