Depth

Origin

Middle English, from dep deep

• 14th Century

Definitions

• 1a (1) : a deep place in a body of water <fish living at great depths> (2) : a part that is far from the outside or surface <the depths of the woods> (3) : abyss

b (1) : a profound or intense state (as of thought or feeling) <the depths of misery>; also : a reprehensibly low condition <hadn't realized that standards had fallen to such depths> (2) : the middle of a time (as winter) (3) : the worst part

• 2:a : the perpendicular measurement downward from a surface

b : the direct linear measurement from front to back

• 3: the quality of being deep
• 4: the degree of intensity <depth of a color>; also : the quality of being profound (as in insight) or full (as of knowledge)
• 5: the quality or state of being complete or thorough <a study will be made in depth>

Description

Three-dimensional space is a geometric 3-parameters model of the physical universe (without considering time) in which we exist. These three dimensions can be labeled by a combination of three chosen from the terms length, width, height, depth, and breadth. Any three directions can be chosen, provided that they do not all lie in the same plane.

In physics and mathematics, a sequence of n numbers can be understood as a location in n-dimensional space. When n = 3, the set of all such locations is called 3-dimensional Euclidean space. It is commonly represented by the symbol . This space is only one example of a great variety of spaces in three dimensions called 3-manifolds.[1]