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We found 28 dictionaries with English definitions that include the word fifth column:
Click on the first link on a line below to go directly to a page where "fifth column" is defined.

General (23 matching dictionaries)

1. fifth column: Merriam-Webster.com [home, info]
2. fifth column: Oxford Dictionaries [home, info]
3. fifth column: American Heritage Dictionary of the English Language [home, info]
4. fifth column: Collins English Dictionary [home, info]
5. fifth column: Vocabulary.com [home, info]
6. fifth column: Macmillan Dictionary [home, info]
7. fifth column: Wordnik [home, info]
8. fifth column: Cambridge Advanced Learner's Dictionary [home, info]
9. fifth column: Wiktionary [home, info]
10. fifth column: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. fifth column: Infoplease Dictionary [home, info]
12. fifth column: Dictionary.com [home, info]
13. fifth column: UltraLingua English Dictionary [home, info]
14. Fifth Column (V TV series), Fifth Column (V franchise), Fifth Column (band), Fifth Column (disambiguation), Fifth Column (intelligence operation), Fifth Column, Fifth-column, Fifth column, The Fifth_Column (film), The Fifth Column: Wikipedia, the Free Encyclopedia [home, info]
15. fifth column: Rhymezone [home, info]
16. fifth column: Free Dictionary [home, info]
17. fifth column: Mnemonic Dictionary [home, info]
18. fifth column: WordNet 1.7 Vocabulary Helper [home, info]
19. fifth column: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. fifth column: Dictionary/thesaurus [home, info]
21. Fifth column: Phrase Finder [home, info]

Computing (1 matching dictionary)

22. fifth column: Encyclopedia [home, info]

Miscellaneous (3 matching dictionaries)

23. fifth column: Political [home, info]
24. fifth column: A Word A Day [home, info]
25. fifth column: Wordcraft Dictionary [home, info]

Slang (1 matching dictionary)

26. fifth column: Urban Dictionary [home, info]

(Note: See fifth_columns for more definitions.)

Quick definitions from WordNet (fifth column) ▸ noun:  a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst ▸ Also see fifth_columns ▸ Words similar to fifth column ▸ Usage examples for fifth column ▸ Words that often appear near fifth column ▸ Rhymes of fifth column ▸ Invented words related to fifth column