Meaning of “depth” - Learner’s Dictionary

depth

noun uk us /depθ/
TOP TO BOTTOM [ C, U ]

B1 the distance from the top of something to the bottom:

The lake reaches a maximum depth of 292 metres.
Dig a hole 10 cm in depth.
FRONT TO BACK [ C, U ]

the distance from the front to the back of something

AMOUNT [ U ]

how much someone knows or feels about something:

She was amazed at the depth of his knowledge.
in depth

B2 giving all the details:

With access to the Internet, students can do their homework in greater depth.

(Definition of “depth” from the Cambridge Learner’s Dictionary © Cambridge University Press)