Numbering Prefixes: "Multi" and "Uni" (Part 2)

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Across
  1. 1. (n.) a group with many members
  2. 4. (n.) a group that sounds like one
  3. 8. (adj.) having the ability to speak many different languages
  4. 9. (adj.) one of a kind; unusual or rare
Down
  1. 2. (adj.) moving in only one direction
  2. 3. (adj.) having many uses
  3. 5. (v.) to join together into one group
  4. 6. (n.) a one-piece leotard and tights combination
  5. 7. (n.) a pill or tablet that includes many nutrients needed for health