Sorry, no online dictionaries contain the exact phrase only if necessary.
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Reverse dictionary results:
1. whether
2. rudimentary
3. decking
4. lie
5. lies
6. lir
7. case
8. providing
9. always
10. perhaps
11. border
12. reserve
13. equation
14. toy
15. patient
16. pinch
17. stretch
18. possibly
19. conditional
20. criminal
21. participate
22. eventually
23. overhaul
24. ultimately
25. provided
26. hemihedral
27. negation
28. lifeline
29. still
30. stilled
31. conjunction
32. peek
33. peeking
34. where
35. weaning
36. anamorphosis
37. alternate
38. alternating
39. decimal
40. unless

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You can look up the words in the phrase individually using these links:   only ?   if ?   necessary ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
only*to search for words beginning with only, or
*saryto search for words ending with sary
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