I believe it means that definition "4" is a formal usage of some word whose identity you have kept secret. " Okay, the definition is talking about the expression "She could yet surprise us all," which is only used formally. "
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JesusenglandI can't understand when it is said formal (She could yet surprise us all.)That dictionary claims that yet makes it formal, not may, might, or could. It has nothing to do with the relative formality of may, might, and could.
Is could more formal than may?