Words with 'sion' suffix

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Across
  1. 4. gradually wearing away
  2. 6. built on the side of a house
  3. 7. concentration or care
  4. 8. understanding the meaning of a passage or text
  5. 9. one of the four operations in maths
Down
  1. 1. make up your mind
  2. 2. streched or strained
  3. 3. bursting release of energy
  4. 4. increasing something
  5. 5. the meaning of an idea