Caitlyn J, Hidalgo.

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Across
  1. 2. any group of ‘3’
  2. 5. hear (audio, audience)
  3. 7. a spear with ‘3’ prongs
  4. 9. shape conform, reform
  5. 12. a group of ‘3’ singers
  6. 13. an athletic contest featuring ‘3’ primary events
  7. 15. a muscle with ‘3’ heads, or places where it attaches
  8. 16. rule (regal, regulate)
Down
  1. 1. (beneficial, benefactor)
  2. 3. (aquifer, aquatics)
  3. 4. (patriarchy, paternal)
  4. 6. a series which consists of ‘3’ books
  5. 8. climb (ascend, transcendent)
  6. 10. see (televise, video)
  7. 11. a bicycle with ‘3’ wheels
  8. 14. to multiply by ‘3’