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Definition: 1 the quality of being deep; deepness. 2 a the perpendicular measurement downwards from a surface. b the distance from front to back. 3 a part that is far from the outside or surface. 4 the degree of intensity depth of a colour . 5 the quality of being profound,(e.g. in insight,) or full,(e.g. of knowledge). 6 (in pl) a a deep place in a body of water the depths of the ocean . b the worst, most intensive, or severest part the depths of winter . c a profound or intense state, e.g. of thought or feeling in the depths of despair * in depth with great thoroughness * out of one's depth in water that is deeper than one's height. 7 beyond one's ability to understand
Source: The Penguin English Dictionary. London: Penguin, 2007. Credo Reference. Web. 14 August 2012.