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1. Shade; Shadow.
2. The invariable or characteristic accompaniment or companion of aperson or thing.
3. Astronomy.

  • The complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off.
  • The dark central portion of a sunspot.
4. phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.