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Valley

Definition: The space inclosed between ranges of hills or mountains;
the strip of land at the bottom of the depressions intersecting a
country, including usually the bed of a stream, with frequently broad
alluvial plains on one or both sides of the stream. Also used
figuratively.

Valley

Definition: The place of meeting of two slopes of a roof, which have
their plates running in different directions, and form on the plan a
reentrant angle.

Valley

Definition: The depression formed by the meeting of two slopes on a
flat roof.