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We found 50 dictionaries with English definitions that include the word first:
Click on the first link on a line below to go directly to a page where "first" is defined.

General (33 matching dictionaries)

1. first: Merriam-Webster.com [home, info]
2. first: Oxford Learner's Dictionaries [home, info]
3. first: American Heritage Dictionary of the English Language [home, info]
4. first: Collins English Dictionary [home, info]
5. first: Vocabulary.com [home, info]
6. first: Macmillan Dictionary [home, info]
7. FIrst, First, First, first: Wordnik [home, info]
8. first: Cambridge Advanced Learner's Dictionary [home, info]
9. First, first: Wiktionary [home, info]
10. first: Webster's New World College Dictionary, 4th Ed. [home, info]
11. first: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. first: Infoplease Dictionary [home, info]
13. FIRST: Dictionary.com [home, info]
14. first: Online Etymology Dictionary [home, info]
15. First, first: UltraLingua English Dictionary [home, info]
16. first: Cambridge Dictionary of American English [home, info]
17. first, first: Cambridge International Dictionary of Idioms [home, info]
18. FIRST (constructor), FIRST, First (Baroness EP), First (Baroness album), First (Cold War Kids song), First (David Gates album), First (Grindelwald), First (Lindsay Lohan song), First (O'Bryan album), First (The Sound of Music), First (disambiguation), First (magazine), First, The First (TV series), The First (album), The First (comics), The First (musical), The First (single), The First (single album), The First: Wikipedia, the Free Encyclopedia [home, info]
19. First: Online Plain Text English Dictionary [home, info]
20. first: Webster's Revised Unabridged, 1913 Edition [home, info]
21. first: Rhymezone [home, info]
22. first: Dictionary/thesaurus [home, info]
23. first: Wikimedia Commons US English Pronunciations [home, info]
24. first: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. first: AllWords.com Multi-Lingual Dictionary [home, info]
26. first: Webster's 1828 Dictionary [home, info]
27. FIRST: Stammtisch Beau Fleuve Acronyms [home, info]
28. first: Free Dictionary [home, info]
29. first: Mnemonic Dictionary [home, info]
30. first: WordNet 1.7 Vocabulary Helper [home, info]
31. First: LookWAYup Translating Dictionary/Thesaurus [home, info]

Art (1 matching dictionary)

32. First: Encyclopedia of Organ Stops [home, info]

Business (1 matching dictionary)

33. first: Legal dictionary [home, info]

Computing (2 matching dictionaries)

34. first: Encyclopedia [home, info]
35. FIRST: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]

Medicine (3 matching dictionaries)

36. FIRST: Vocabulary of Loss: Suicide, Grief, and Ethics [home, info]
37. first: Medical dictionary [home, info]
38. first: online medical dictionary [home, info]

Miscellaneous (4 matching dictionaries)

39. FIRST: AbbreviationZ [home, info]
40. first: Idioms [home, info]
41. first: Encyclopedia of Graphic Symbols [home, info]
42. FIRST: Acronym Finder [home, info]

Science (3 matching dictionaries)

43. first: LITTLE EXPLORERS(TM) Picture Dictionary [home, info]
44. first: MATH SPOKEN HERE! [home, info]
45. FIRST: Extragalactic Astronomy [home, info]

Slang (1 matching dictionary)

46. First, first, the first: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

47. first: Book Collectors' Glossary [home, info]
48. First: AUTOMOTIVE TERMS [home, info]

(Note: See firsts for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (first) ▸ noun:  an honours degree of the highest class ▸ noun:  the first element in a countable series ("The first of the month") ▸ noun:  the first or highest in an ordering or series ("He wanted to be the first") ▸ noun:  the fielding position of the player on a baseball team who is stationed at first base ▸ noun:  the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving ▸ noun:  the time at which something is supposed to begin ▸ adjective:  indicating the beginning unit in a series ▸ adjective:  being the gear producing the lowest drive speed ("Use first gear on steep hills") ▸ adjective:  ranking above all others ("Was first in her class") ▸ adjective:  preceding all others in time or space or degree ("The first house on the right") ▸ adjective:  highest in pitch or chief among parts or voices or instruments or orchestra sections ("First soprano") ▸ adjective:  serving to begin ("The first verse") ▸ adjective:  serving to set in motion ("His first (or maiden) speech in Congress") ▸ adverb:  before anything else ("First we must consider the garter snake") ▸ adverb:  the initial time ("When Felix first saw a garter snake") ▸ adverb:  before another in time, space, or importance ("I was here first") ▸ adverb:  prominently forward ▸ name:  A surname (very rare: popularity rank in the U.S.: #29015) ▸ Also see firsts ▸ Word origin ▸ Words similar to first ▸ Usage examples for first ▸ Idioms related to first (New!) ▸ Popular adjectives describing first ▸ Popular nouns described by first ▸ Words that often appear near first ▸ Rhymes of first ▸ Invented words related to first