[val.ley] n, pl valleys [ME valey, fr. OF valee, fr. val valley--more at vale] (14c) 1 a: an elongate depression of the earth's surface usu. between ranges of hills or mountains b: an area drained by a river and its tributaries
2: a low point or condition 3 a: hollow, depression b: the place of meeting of two slopes of a roof that form on the plan a reentrant angle