<p><strong>Noun</strong></p><ul><li>an elongated depression between uplands, hills, or mountains, especially one following the course of a stream.</li><li>an extensive, more or less flat, and relatively low region drained by a great river system.</li><li>any depression or hollow resembling a valley.</li><li>a low point or interval in any process, representation, or situation.</li><li>any place, period, or situation that is filled with fear, gloom, foreboding, or the like: the valley of despair.</li><li>a depression or angle formed by the meeting of two inclined sides of a roof.</li><li>the lower phase of a horizontal wave motion.</li></ul>