Meaning of “definition” in the English Dictionary

"definition" in British English

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definitionnoun

uk /ˌdef.ɪˈnɪʃ.ən/ us /ˌdef.ɪˈnɪʃ.ən/

definition noun (EXPLANATION)

B2 [ C ] a statement that explains the meaning of a word or phrase:

a dictionary definition
What is the definition of "mood"?

[ C ] a description of the features and limits of something:

The legal definition of what is and what is not pornography is very unsatisfactory.
by definition

because of its own features:

Psychology is by definition an inexact science.

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(Definition of “definition” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"definition" in American English

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definitionnoun

us /ˌdef·əˈnɪʃ·ən/

definition noun (EXPLANATION)

English [ C ] a statement that explains the meaning of a word or phrase:

What is the definition of “mood”?

definition noun (SEEING CLEARLY)

[ U ] the degree to which something can be clearly seen or heard:

The tape recorded conversation lacked definition – there was too much background noise.

Idiom(s)

(Definition of “definition” from the Cambridge Academic Content Dictionary © Cambridge University Press)