Depth is the measure of how deep something goes. The swimming pool has a depth of six feet. The well has an unknown depth. People can be deep as well—you know by looking at some people that they have depth.

Depth goes with other measure words that end in "th." Length is how long something is. Breadth is how wide or broad. The expression "plumb the depths" means to take a measure of how deep something goes. Depth also can mean deepness—your English teacher might instruct you to write papers with depth.

Definitions of depth
  1. noun
    the extent downward or backward or inward
    “the depth of the water”
    depth of a shelf”
    depth of a closet”
    synonyms: deepness
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    deepness, profoundness, profundity
    the quality of being physically deep
    draft, draught
    the depth of a vessel's keel below the surface (especially when loaded)
    the depth to which something penetrates (especially the depth reached by a projectile that hits a target)
    a measure of the depth of water taken with a sounding line
    the quality of lacking physical depth
    the property of being very deep; without limit
    shallowness in terms of affecting only surface layers of something
    type of:
    the distance or area or volume over which something extends
  2. noun
    the intellectual ability to penetrate deeply into ideas
    synonyms: astuteness, deepness, profoundness, profundity
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    type of:
    sapience, wisdom
    ability to apply knowledge or experience or understanding or common sense and insight
  3. noun
    the attribute or quality of being deep, strong, or intense
    “the depth of his breathing”
    “"the depth of his sighs," "the depth of his emotion”
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    type of:
    an abstraction belonging to or characteristic of an entity
  4. noun
    degree of psychological or intellectual profundity
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    profoundness, profundity
    intellectual depth; penetrating knowledge; keen insight; etc
    shallowness, superficiality
    lack of depth of knowledge or thought or feeling
    glibness, slickness
    a kind of fluent easy superficiality
    pretentious superficiality of knowledge
    type of:
    degree, grade, level
    a position on a scale of intensity or amount or quality
  5. noun
    (usually plural) the deepest and most remote part
    “signals received from the depths of space”
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    back of beyond
    a very remote and inaccessible place
    type of:
    part, region
    the extended spatial location of something
  6. noun
    (usually plural) a low moral state
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    type of:
    abasement, abjection, degradation
    a low or downcast state
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