metaphysics

/ˌmɛtəˈfɪzɪks/
noun
  1. The branch of philosophy that deals with the nature of reality, existence, time, space, causality, and the relationship between mind and matter.
    • Metaphysics asks questions like 'Why is there something rather than nothing?'
    • In college, she took a course on metaphysics and learned about the nature of being.
    • Many ancient philosophers considered metaphysics the highest form of knowledge.
  2. Abstract or difficult theory or talk, especially about things beyond the physical world.
    • I find his writing full of unnecessary metaphysics that confuses the reader.
    • The conversation drifted into metaphysics when they started discussing the meaning of life.
    • The movie's plot was so full of metaphysics that I couldn't follow the story.
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