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English definition of “define”

define

verb [T] uk   /dɪˈfaɪn/ us  

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)?
See also
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.

define verb [T] (CLEARLY SHOW)

to show clearly the edge of something: The outline of the castle on the hill was clearly defined against the evening sky.
definable
adjective uk   /dɪˈfaɪ.nə.bl̩/ us  
definable rules of grammar/syntax
(Definition of define from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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