Meaning of “define” in the English Dictionary

"define" in British English

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defineverb [ T ]

uk /dɪˈfaɪn/ us /dɪˈfaɪn/

define verb [ T ] (EXPLAIN)

B2 to say what the meaning of something, especially a word, is:

In the dictionary, "reality" is defined as "the state of things as they are, rather than as they are imagined to be".
Before I answer your question, could you define your terms a little more (= explain what you mean by the words you have used)?
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B2 to explain and describe the meaning and exact limits of something:

Your rights and responsibilities are defined in the citizens' charter.
Your role in the project will be strictly defined (= limited to particular areas).
I'd hate to feel that I was defined by (= that my life got its meaning and importance only from) my job.

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definable
adjective uk /dɪˈfaɪ.nə.bəl/ us /dɪˈfaɪ.nə.bəl/

definable rules of grammar/syntax

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

"define" in American English

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defineverb [ T ]

us /dɪˈfɑɪn/

define verb [ T ] (EXPLAIN)

English to describe the meaning of something, esp. a word, or to explain something more clearly so that it can be understood:

How would you define “jaded”?

define verb [ T ] (SHOW)

to show clearly the edge or shape of something:

The dark figures are sharply defined on the white background.
definable
adjective /dɪˈfɑɪ·nə·bəl/

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

"define" in Business English

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defineverb [ T ]

uk /dɪˈfaɪn/ us

to say what the meaning of something, especially a word, is:

Economists normally define a recession as two successive quarters of negative growth.

to explain and state the meaning and exact limits of something:

a defined goal/objective
If you want employees to be more productive, then you must define and measure productivity precisely.

(Definition of “define” from the Cambridge Business English Dictionary © Cambridge University Press)