Sorry, no online dictionaries contain the exact phrase undefined function.
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Reverse dictionary results:
1. discontinuity
 2. measure
3. alarm
4. shadow
5. shadowed
6. sometime
7. any
8. district
9. spell
10. area
 11. case
12. cis-trans test
13. command
14. domain
15. dyad
16. functional
17. functionality
18. image
19. imaging
20. implicit
 21. infinity
22. instruction
23. job
24. leg
25. legs
26. leh
27. mark
28. mode
29. operator
30. period
 31. place
32. placed
33. placing
34. position
35. positioning
36. province
37. range
38. ranged
39. ranging
40. recursion

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You can look up the words in the phrase individually using these links:   undefined ?   function ?
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