depth

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

n the extent downward or backward or inward

“the depth of the water”
depth of a shelf”
depth of a closet”
Synonyms:
deepness
Types:
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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)
penetration
the depth to which something penetrates (especially the depth reached by a projectile that hits a target)
sounding
a measure of the depth of water taken with a sounding line
shallowness
the quality of lacking physical depth
bottomlessness
the property of being very deep; without limit
superficiality
shallowness in terms of affecting only surface layers of something
Type of:
extent
the distance or area or volume over which something extends

n the intellectual ability to penetrate deeply into ideas

Synonyms:
astuteness, deepness, profoundness, profundity
Type of:
sapience, wisdom
ability to apply knowledge or experience or understanding or common sense and insight

n 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”
Type of:
attribute
an abstraction belonging to or characteristic of an entity

n degree of psychological or intellectual profundity

Types:
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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
sciolism
pretentious superficiality of knowledge
Type of:
degree, grade, level
a position on a scale of intensity or amount or quality

n (usually plural) the deepest and most remote part

“from the depths of darkest Africa”
“signals received from the depths of space”
Types:
back of beyond
a very remote and inaccessible place
Type of:
part, region
the extended spatial location of something

n (usually plural) a low moral state

“he had sunk to the depths of addiction”
Type of:
abasement, abjection, degradation
a low or downcast state

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