We found 22 dictionaries that define the word alpha and omega:

General (16 matching dictionaries)

1. alpha and omega, the alpha and omega: Merriam-Webster
2. alpha and omega: Oxford Learner's Dictionaries
3. alpha and omega: American Heritage Dictionary of the English Language
4. alpha and omega: Collins English Dictionary
5. alpha and omega: Vocabulary.com
6. alpha and omega: Wordnik
7. alpha and omega: Wiktionary
8. alpha and omega: The Wordsmyth English Dictionary-Thesaurus
9. alpha and omega: Infoplease Dictionary
10. alpha and omega: Dictionary.com
11. Alpha and Omega (Bizzy Bone album), Alpha and Omega (Supernatural), Alpha and Omega (disambiguation), Alpha and Omega (film), Alpha and Omega (film series), Alpha and Omega (radio plays), Alpha and Omega, Alpha and omega: Wikipedia, the Free Encyclopedia
12. alpha and omega: Rhymezone
13. alpha and omega: FreeDictionary.org
14. alpha and omega: Mnemonic Dictionary
15. alpha and omega: TheFreeDictionary.com
16. alpha and omega: Merriam-Webster

Art (1 matching dictionary)

17. Alpha and Omega: Dictionary of Symbolism

Miscellaneous (2 matching dictionaries)

18. ALPHA and OMEGA: Masonic Dictionary
19. alpha and omega: Idioms

Religion (1 matching dictionary)

20. Alpha and Omega (in Scripture), Alpha and Omega: Catholic Encyclopedia

Slang (2 matching dictionaries)

21. alpha and omega: Green’s Dictionary of Slang
22. alpha and omega: Urban Dictionary

(Note: See alpha_and_omegas as well.)

Definitions from Wiktionary (Alpha and Omega) ▸ noun:  The first and last; the beginning and end. ▸ noun:  Alternative letter-case form of alpha and omega [The first and last; the beginning and end.] Similar: alpha, omega, alphamerics, initial, alaph, aleph, alphanumerical, alphagram, alphanumeric, apex, more... Opposite: beginning and end, start and finish, first and last Adjectives: nextgen, intertestamental, period, nundinal, calendric, delicate, chiliastic, ember, next generation, hebdomadal, calendarial ▸ Words similar to alpha and omega ▸ Usage examples for alpha and omega ▸ Idioms related to alpha and omega ▸ Wikipedia articles (New!) ▸ Words that often appear near alpha and omega ▸ Rhymes of alpha and omega ▸ Invented words related to alpha and omega