Webster's English Dictionary

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valley

val.ley \'val-e-\ n [ME valey, fr. OF valee, fr. val valley - more at VALE 
   often attrib M 1a: an elongate depression of the earth's surface usu. 
   between ranges of hi lls or mountains 1b: an area drained by a river and 
   its tributaries  2a: HOLLOW, DEPRESSION  2b: the place of meeting of two 
   slopes of a roof that form on the plan a re entrant angle