Preposition.

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Across
  1. 2. A preposition indicating direction, meaning "into a specific place" (4 letters)
  2. 4. A preposition that shows time, meaning "before a certain point" (5 letters)
  3. 5. A preposition that means "near to" or "next to" (5 letters)
  4. 7. A preposition that shows the source of something, meaning "out of" or "from inside" (4 letters)
  5. 8. A preposition used to compare, meaning "as compared with" (4 letters)
Down
  1. 1. A preposition that shows time, meaning "during the time of" (2 letters)
  2. 3. A preposition used to indicate position, meaning "above something" (4 letters)
  3. 4. A preposition meaning "below the surface" or "beneath" (5 letters)
  4. 6. A preposition that means "in the middle of" or "surrounded by" (6 letters)
  5. 8. A preposition used to show direction, meaning "toward a specific destination" (2 letters)