in depth Definition

depth
noun

1. Deepness; the distance from the top downwards, from the front to the back or from the surface inwards.

Thesaurus: declination, pitch, remoteness.
2. Said of feelings or colours: intensity or strength.
3. Extensiveness.

Example: the depth of one's knowledge
Thesaurus: profundity, wisdom, acumen, insight, sagacity, weight, perspicacity, shrewdness, reconditeness; Antonym: shallowness, superficiality.
4. Somewhere far from the surface or edge of somewhere.

Example: the depths of the ocean
Example: the depths of the country
Form: the depths (usually)
5. An extreme feeling (of despair, sadness, etc) or great degree (of deprivation, etc).

Form: the depths (usually)
6. The middle and severest or most intense part (of winter, etc).

Form: the depths (often)
7. Serious aspects of a person's character that are not immediately obvious.

Form: depths
8. Said of sound: lowness of pitch.

Idiom: in depth

Deeply and thoroughly.

Idiom: out of one's depth

In water so deep that one would be below the surface even when standing up.

Not able to understand information or an explanation, or in a situation which is too difficult for one to deal with.

Etymology: 14c: from Anglo-Saxon deop deep.