Sorry, no online dictionaries contain the exact phrase mass equivalence.
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Reverse dictionary results:
1. special theory of relativity
 2. balance
3. balancing
4. conformity
5. equal
6. equivalent
7. match
8. matched
9. par
10. parity
 11. synonymy
12. consistency
13. equality
14. equation
15. for
16. proportionate
17. symmetrical
18. coherence
19. identity
20. individuality
 21. pity
22. -age
23. amen
24. asia
25. atomic mass unit
26. average
27. baryon
28. cab
29. cake
30. carbon
 31. clod
32. conductance
33. current
34. drift
35. drifting
36. drop
37. dyne
38. gamma
39. gram
40. great

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