Merriam-Webster's Collegiate® Dictionary, 11th Edition
AMBLE
I. intransitive verb (ambled; ambling) see: elastic
Date: 14th century
to go at or as if at an amble ; saunter , ambler noun
II. noun
Date: 14th century
1. an easy gait of a horse in which the legs on the same side of the body move together, rack VII,b, an easy gait, a leisurely walk