Background knowledge

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Across
  1. 2. particular subset of knowledge (e.g., facts about the world, events, people, sayings and phrases) that is needed to comprehend and learn from a particular situation, lesson, or text.
  2. 3. a comparison between two things, typically for the purpose of explanation or clarification
  3. 5. the action or capability of understanding something.
Down
  1. 1. the knowledge of words as well as the meaning of words
  2. 4. the parts of something written or spoken that immediately precede and follow a word or passage and clarify its meaning.