We found 5 dictionaries that define the word X.3:

General (1 matching dictionary)

1. X.3: Dictionary.com

Computing (3 matching dictionaries)

2. X.3: Free On-line Dictionary of Computing
3. I T Glossary (No longer online)
4. X.3: Encyclopedia

Tech (1 matching dictionary)

5. X.3: Webster's New World Telecom Dictionary

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