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

Etymology

Origin of depth

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

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

AI is supercharging employers’ background checks, making it easier and cheaper to track workers’ online history with more depth than before, Callum Borchers writes.

From The Wall Street Journal ● Jul. 22, 2026

Kiernan would bring attacking depth to Newcastle, who have had a busy transfer window with six additions as they prepare to challenge for the WSL 2 title.

From BBC ● Jul. 22, 2026

Five companies stood out because of the depth of their documented commitment to AI — in filings, in capital allocation and in workforce decisions.

From MarketWatch ● Jul. 20, 2026

This allows it to recover depth and reconstruct a scene in three dimensions.

From Science Daily ● Jul. 17, 2026

The plants quivered at the depth of the sound.

From "City of the Plague God" by Sarwat Chadda

But in true Hollywood fashion, studios are already scouring the depths of the internet, in search of untapped talent and viral content that could re-create a similar success.

From Los Angeles Times ● Jul. 14, 2026

"This reckless attack failed but could have caused 500,000 citizens to lose electricity in the depths of winter," the British foreign office said.

From Barron's ● Jul. 13, 2026

According to the study, once these particles reach depths of about 2 to 6 kilometers, the enormous hydrostatic pressure begins forcing dissolved organic matter out of them.

From Science Daily ● Jul. 12, 2026

One often feels with Hitchcock that beneath the director of thrillers dwells a frustrated psychoanalyst, eager to penetrate the hidden depths of the human personality.

From The Wall Street Journal ● Jul. 10, 2026

After all, she was guided by the Afterlife now, and she’d not been chased into the depths of Fernlight by a vicious mob.

From "The Undead Fox of Deadwood Forest" by Aubrey Hartman

Related Words

• acumen
• intellect
• intelligence
• sense