Inter - between and among

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Across
  1. 3. the break between parts of a play, opera, or concert
  2. 4. to throw a remark into a conversation between two or more people
  3. 6. between the states
  4. 7. to get in between two people when it is not your problem or issue
  5. 9. the worldwide computer system that allows communication and information sharing among people
Down
  1. 1. involving people playing among themselves; an exchange of activity or information between people or people and a computer
  2. 2. to break into a conversation between people
  3. 4. between people (usually describing social activities)
  4. 5. between or among the nations of the world
  5. 8. a person who helps translate the languages between different people