unus and duo

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Across
  1. 2. one of many
  2. 3. two homes in one building
  3. 4. fight
  4. 5. America's motto
  5. 11. make a second
  6. 12. two people that sing a song
Down
  1. 1. one part of something
  2. 2. a cosmic pinwheel
  3. 3. a double cross
  4. 6. many colleges as one
  5. 7. horse with a horn on it head
  6. 8. together as one
  7. 9. instruments playing the same thing at the same time
  8. 10. two
  9. 11. doubtful