- noun a long low area, usually with a river at the bottom, between hills or mountains
- noun an area of low-lying land between mountains or hills
- The place where two planes of a roof meet at a downward, or "V," angle.
- noun an area of low ground flanked by hills, usually with a river running through it
Origin & History of “valley”
Valley comes via Anglo-Norman valey from *vallāta, a vulgar Latin derivative of Latin vallis ‘valley’, whose origins are uncertain. A more direct English descendant of vallis is vale (13th c.).