depth

American  

[depth] / dɛpθ /

noun

• depths
  plural

1. a dimension taken through an object or body of material, usually downward from an upper surface, horizontally inward from an outer surface, or from top to bottom of something regarded as one of several layers.

2. the quality of being deep; deepness.

3. complexity or obscurity, as of a subject.

   a question of great depth.

4. gravity; seriousness.

   I don't think you recognize the depth of the problem.

   Synonyms:

   weight, significance, importance, import

5. emotional profundity.

   the depth of someone's feelings.

6. intensity, as of silence, color, etc.

7. lowness of tonal pitch.

   the depth of a voice.

8. the amount of knowledge, intelligence, wisdom, insight, feeling, etc., present in a person's mind or evident either in some product of the mind, as a learned paper, argument, work of art, etc., or in the person's behavior.

9. a high degree of such knowledge, insight, etc.

10. Often depths a deep part or place.

    from the depths of the ocean.

11. an unfathomable space; abyss.

    the depth of time.

12. Sometimes depths the farthest, innermost, or extreme part or state.

    the depth of space;

    the depths of the forest;

    the depths of despair.

13. Usually depths. a low intellectual or moral condition.

    How could he sink to such depths?

14. the part of greatest intensity, as of night or winter.

15. Sports. the strength of a team in terms of the number and quality of its substitute players.

    With no depth in the infield, an injury to any of the regulars would be costly.

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idioms

1. in depth, extensively or thoroughly.

   Make a survey in depth of the conditions.

2. out of / beyond one's depth,

   1. in water deeper than one's height or too deep for one's safety.

   2. beyond one's knowledge or capability.

      The child is being taught subjects that are beyond his depth.

depth British  

/ dɛpθ /

noun

1. the extent, measurement, or distance downwards, backwards, or inwards

2. the quality of being deep; deepness

3. intensity or profundity of emotion or feeling

4. profundity of moral character; penetration; sagacity; integrity

5. complexity or abstruseness, as of thought or objects of thought

6. intensity, as of silence, colour, etc

7. lowness of pitch

8. nautical the distance from the top of a ship's keel to the top of a particular deck

9. (often plural) a deep, far, inner, or remote part, such as an inaccessible region of a country

10. (often plural) the deepest, most intense, or most severe part

    the depths of winter

11. (usually plural) a low moral state; demoralization

    how could you sink to such depths?

12. (often plural) a vast space or abyss

13. 1. in water deeper than one is tall

    2. beyond the range of one's competence or understanding

14. thoroughly or comprehensively See also in-depth

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depth More Idioms  

1. see in depth; out of one's depth.

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Other Word Forms

Derived Forms

• depthless
  adjective

Inflected Forms

Nouns

• depths
  plural

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Etymology

Origin of depth

First recorded in 1350–1400; Middle English depthe, equivalent to deep + -th ¹

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Explanation

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.

Example Sentences

See Examples For:

depth depths

Any depegging of stablecoins or deterioration of market depth would show that the contagion is spreading, she says.

From The Wall Street Journal ● Oct. 30, 2026

The Lakers looked to bolster their depth at center by signing 7-foot center Lawson Lovering to a two-way contract Wednesday and waiving forward AK Okereke.

From Los Angeles Times ● Oct. 29, 2026

Press down hard using your body weight, to a depth of about 5-6cm before releasing the pressure, allowing the chest to come back up.

From BBC ● Oct. 29, 2026

Combine that bleak outcome with the advent of DVR and social media — where any event can be discussed in depth, immediately — and boom: Bye bye, watercooler.

From Salon ● Oct. 25, 2026

The pressure and cold at that depth is dangerous.

From "The Line Tender" by Kate Allen

In a securities filing, it pointed to recent and future offerings from the likes of Alphabet, SpaceX, Anthropic and OpenAI as challenges to the depths of capital markets.

From The Wall Street Journal ● Oct. 31, 2026

The rock appears to have experienced unusually hot conditions at shallower depths before entering an environment with a relatively cooler temperature pattern farther down.

From Science Daily ● Oct. 22, 2026

"Should we get to the depths of winter and there's a massive spike in costs of oil, for example, we do have the ability to react to that," she added.

From BBC ● Oct. 22, 2026

Normally, trade winds blow east to west along the equator, pushing warm water from South America toward Asia, while cold water rises from the depths to replace it.

From Barron's ● Oct. 19, 2026

Her eyes grew wide with shock, but a glint of admiration twinkled in their depths.

From "Summer of the Mariposas" by Guadalupe García McCall

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