Sorry, no online dictionaries contain the exact phrase first operation.
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Reverse dictionary results:
1. begin
 2. primed
3. inti
4. into
5. multiplication
6. abortion
7. affair
8. application
9. beachhead
10. begun
 11. buck
12. burn
13. business
14. call
15. catch
16. close
17. commence
18. derivation
19. die
20. field
 21. game
22. impression
23. inaugural
24. inaugurate
25. inauguration
26. introduce
27. introduced
28. law
29. meet
30. mode
 31. money
32. omaha
33. open
34. opened
35. opening
36. order
37. out
38. placing
39. planting
40. play

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You can look up the words in the phrase individually using these links:   first ?   operation ?
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