Sorry, no online dictionaries contain the exact phrase 2019 redefinition of the SI base units.

Reverse dictionary results:
1. metre
 2. fundamental unit
3. metric system
4. mark
5. candela
6. kelvin
7. kilogram
8. mole
9. kinetic energy
10. potential energy
 11. derived unit
12. mount
13. accommodation
14. line
15. call sign
16. cuts
17. emergency
18. gang
19. seismograph
20. torque
 21. vote
22. admeasure
23. alignment
24. conterminous
25. determine
26. meaning
27. proportion
28. proportioned
29. proportions
30. recension
 31. refit
32. two
33. absolute
34. reckon
35. service
36. set
37. settlement
38. contrast
39. conversion
40. figure

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You can look up the words in the phrase individually using these links:   2019 ?   redefinition ?   of ?   the ?   si ?   base ?   units ?
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