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We found 29 dictionaries with English definitions that include the word countdown:
Click on the first link on a line below to go directly to a page where "countdown" is defined.

General (25 matching dictionaries)

1. countdown: Merriam-Webster.com [home, info]
2. countdown: Oxford Dictionaries [home, info]
3. countdown: American Heritage Dictionary of the English Language [home, info]
4. countdown: Collins English Dictionary [home, info]
5. countdown: Vocabulary.com [home, info]
6. countdown: Macmillan Dictionary [home, info]
7. Countdown, countdown: Wordnik [home, info]
8. countdown: Cambridge Advanced Learner's Dictionary [home, info]
9. countdown: Wiktionary [home, info]
10. countdown: Webster's New World College Dictionary, 4th Ed. [home, info]
11. countdown: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. countdown: Infoplease Dictionary [home, info]
13. countdown: Dictionary.com [home, info]
14. countdown: UltraLingua English Dictionary [home, info]
15. countdown: Cambridge Dictionary of American English [home, info]
16. Countdown (Australian TV series), Countdown (Dutch TV series), Countdown (Exo album), Countdown (G.I. Joe), Countdown (Hardwell and MAKJ song), Countdown (Hyde song), Countdown (Jimmy McGriff album), Countdown (MuchMusic), Countdown (Polystyle Publications), Countdown (Pulp song), Countdown (Rush song), Countdown (comic), Countdown (comics), Countdown (disambiguation), Countdown (film), Countdown (game show), Countdown (music show), Countdown (rush song), Countdown (supermarket), Countdown (video game), Countdown, The Countdown (Mulgrew Miller album): Wikipedia, the Free Encyclopedia [home, info]
17. countdown: Cambridge International Dictionary of Phrasal Verbs [home, info]
18. countdown: Rhymezone [home, info]
19. countdown: Free Dictionary [home, info]
20. countdown: Mnemonic Dictionary [home, info]
21. countdown: WordNet 1.7 Vocabulary Helper [home, info]
22. countdown: LookWAYup Translating Dictionary/Thesaurus [home, info]
23. countdown: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

24. Countdown: MoneyGlossary.com [home, info]

Computing (1 matching dictionary)

25. countdown: Encyclopedia [home, info]

Slang (1 matching dictionary)

26. The Countdown, countdown: Urban Dictionary [home, info]

Tech (1 matching dictionary)

27. Countdown: Explosives [home, info]

(Note: See countdowns for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (countdown) ▸ noun:  counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle) ▸ Also see countdowns ▸ Words similar to countdown ▸ Usage examples for countdown ▸ Popular adjectives describing countdown ▸ Words that often appear near countdown ▸ Rhymes of countdown ▸ Invented words related to countdown