What does orthogonal mean in OFDM?

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Tags

1. #division
2. #multiple
3. #closely
4. #numerous
5. #spectra
6. #signals
7. #carrier
8. #spaced
9. #overlapping
10. #frequencies
11. #telecommunications
12. #emitted
13. #frequency
14. #orthogonal
15. #carry
16. #digital
17. #multiplexing
18. #encoding
19. #method