Metre/Meter; PRE-, ANTE-, FORE-, POST-

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Across
  1. 5. distance around
  2. 6. come before or cause
  3. 7. future
  4. 9. distance through the center
  5. 10. prevention
Down
  1. 1. measures air pressure
  2. 2. do it later
  3. 3. before Civil War
  4. 4. specializing in vision correction
  5. 8. same on both sides