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We found 26 dictionaries with English definitions that include the word first base:
Click on the first link on a line below to go directly to a page where "first base" is defined.

General (22 matching dictionaries)

1. first base: Merriam-Webster.com [home, info]
2. first base: Oxford Dictionaries [home, info]
3. first base: American Heritage Dictionary of the English Language [home, info]
4. first base: Collins English Dictionary [home, info]
5. first base: Vocabulary.com [home, info]
6. first base: Macmillan Dictionary [home, info]
7. first-base: Wordnik [home, info]
8. first base: Cambridge Advanced Learner's Dictionary [home, info]
9. First base: Wiktionary [home, info]
10. first base: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. first base: Infoplease Dictionary [home, info]
12. first base: Dictionary.com [home, info]
13. first base: UltraLingua English Dictionary [home, info]
14. First Base (album), First base (disambiguation), First base: Wikipedia, the Free Encyclopedia [home, info]
15. first base: Rhymezone [home, info]
16. first base: Free Dictionary [home, info]
17. first base: Mnemonic Dictionary [home, info]
18. first base: WordNet 1.7 Vocabulary Helper [home, info]
19. first base: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. first base: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

21. first base: Encyclopedia [home, info]

Slang (2 matching dictionaries)

22. first base: English slang and colloquialisms used in the United Kingdom [home, info]
23. first base: American-Australian Slang Dictionary [home, info]

Sports (1 matching dictionary)

24. First base: winyourwager.com Gambling Glossary [home, info]

Quick definitions from WordNet (first base) ▸ noun:  the initial stage in accomplishing something ("We didn't get to first base with that approach") ▸ noun:  the fielding position of the player on a baseball team who is stationed at first base ▸ noun:  the base that must be touched first by a base runner in baseball ▸ Words similar to first base ▸ Words that often appear near first base ▸ Rhymes of first base ▸ Invented words related to first base