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n. pl. val·leys
1. An elongated lowland between ranges of mountains, hills, or other uplands, often having a river or stream running along the bottom.
2. An extensive area of land drained or irrigated by a river system.
3. A depression or hollow resembling or suggesting a valley, as the point at which the two slopes of a roof meet.
[Middle English valey, from Old French valee, from Vulgar Latin *vallāta, from Latin vallēs; see wel- in Indo-European roots.]
(Physical Geography) having a valley