Definitions from Wiktionary ( )

▸ noun:  An elongated depression cast between hills or mountains, often with a river flowing through it.
▸ noun:  An area which drains itself into a river.
▸ noun:  Any structure resembling one, e.g. the interior angle formed by the intersection of two sloping roof planes.
▸ verb:  (intransitive, poetic, rare) To form the shape of a valley.
▸ noun:  (countable) A surname from landforms.
▸ noun:  A placename:
▸ noun:  A community of Colchester, Nova Scotia, Canada.
▸ noun:  A city in Chambers County, Alabama, United States, on the Georgia state line.
▸ noun:  A city in Nebraska, United States.
▸ noun:  A number of townships in the United States, listed under Valley Township.
▸ noun:  A village and community in Anglesey, Wales (OS grid ref SH2979).
▸ noun:  Ellipsis of San Fernando Valley; a valley of southern California, United States. [A valley and region of Los Angeles County, California north of the Santa Monica Mountains, including the northern part of the city of Los Angeles and the cities of Calabasas, Burbank, Glendale, Hidden Hills, and San Fernando.]
▸ noun:  Ellipsis of Silicon Valley. [(informal) Originally, the region of the San Francisco Bay Area in which there were a high number of industries producing silicon chips; later extended to mean the entire concentration of high-tech businesses in this area.]

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