1. operate on perform surgery on
  2. operation process or manner of functioning
  3. imperative requiring attention or action
  4. aberration a state or condition markedly different from the norm
  5. oppression the act of subjugating by cruelty
  6. operator an agent that operates some apparatus or machine
  7. operate perform as expected when applied
  8. appertain be a part or attribute of
  9. operating involved in a kind of operation
  10. Aberdeen a city in northeastern Scotland on the North Sea
  11. operative producing a desired effect
  12. opportune suitable or advantageous especially for a particular purpose
  13. operatic of or relating to or characteristic of opera
  14. opera hood a large cloak worn over evening clothes
  15. operon a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene
  16. operations financial transactions at a brokerage
  17. aperture a natural opening in something
  18. cooperation the practice of working together on a common enterprise
  19. operetta a short amusing opera
  20. eye operation any surgical procedure involving the eyes