riding

adjective

1. that rides
2. used in or for riding or traveling: a riding costume, riding horses
3. ☆ designed to be operated by a rider: a riding mower

noun

noun

1. any of the three former administrative divisions (North Riding, East Riding, and West Riding) of Yorkshire, England
2. any similar division in the Commonwealth; specif., a Canadian electoral district

Origin: ME (t)riding < OE -thrithing, a third part (only in L contexts) < ON thrithjungr < thrithi, third: initial t was lost to the preceding sound in compounds formed with North-, East-, and West-