The term "relevant knowledge" means that one would know related information about a topic that is being discussed. That information will also be related to what is being spoken about.

Aristotle ; see relevant link .

what are the relevance of knowledge theories of language development

Plato's assumption that certain ideas are inborn is most directly relevant to the controversy regarding the nature of knowledge acquisition and the existence of innate knowledge versus knowledge based on experience. It raises questions about the origins of our understanding, the role of prior knowledge in learning, and the extent to which knowledge is pre-existing within the individual.

Rational knowledge is based on both experience and cognition. A rational person takes all relevant information into consideration when making a decision.