The existence of multiple competing definitions with acknowledged tradeoffs presupposes a shared target phenomenon against which each definition is evaluated as more or less adequate.

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Presupposes(as describing what Plantinga's argument takes for granted): Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.
Tradeoffs(in decision-making and ethics): Situations where you have to give up something you want in order to get something else you want—you can't have both.
adequate(Modal logic): A system is adequate for a class of frames when it is both sound and complete with respect to validity over that class
definition(Standard philosophical conception of what a definition must accomplish): Something that provides necessary and sufficient conditions for some thing x to be F
knowledge(Distinguished from mere true belief, which may be the product of indoctrination and need not exercise deliberative capacities.)

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