Sorry, no online dictionaries contain the exact phrase primary engine.
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Reverse dictionary results:
1. booster
2. brain
3. fire
4. first
5. guide
6. guiding
7. head
8. lead
9. pound
10. prime
11. prime mover
12. primed
13. primer
14. second
15. seconds
16. race
17. red
18. contact
19. thrust
20. account
21. accounting
22. anchor
23. axis
24. azoth
25. basis
26. battery
27. bauxite
28. beat
29. beats
30. brains
31. breadwinner
32. capital
33. central
34. constitution
35. core
36. cpu
37. critical
38. democracy
39. derivative
40. division

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You can look up the words in the phrase individually using these links:   primary ?   engine ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
prim*to search for words beginning with prim, or
*gineto search for words ending with gine
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