When an scholar offers a definition in one of his works, should it be such that it is not refutable because no other definition would be better then his/her?

Put in other way: after all, what makes a definition the _sole answer_ to the  question "what is......?"

E.g., say one defines the word "genocide."

S/he defines it as "deliberate extermination of a people or nation," is this definition "complete" or does it need further information to make it "complete?"

If there is a better explanation, does it supersedes and/or replaces the above?

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