Equivocation on 'best' between 'most empirically adequate' and 'most ontologically parsimonious' means IBE selects different conclusions depending on which reading is operative at any given inferential step.

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Equivocation(Lewis diagnoses the ontological argument as equivocating on 'a being than which nothing greater can be conceived is possible'.): A fallacy in which a key term or phrase is used in two different senses within the same argument, making an invalid inference appear valid.
IBE(Discussed in the context of its compatibility with Bayesian epistemology): Inference to the Best Explanation — a mode of inference in which one infers a hypothesis because it best explains the available evidence
Ontologically parsimonious(as a philosophical standard for evaluating theories): Having fewer things that actually exist; philosophers prefer theories that don't multiply the number of things the world needs to contain.
empirically adequate(philosophy of science): A model or theory that correctly predicts what we actually observe in experiments, even if it might not describe what's 'really' happening underneath.

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