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We found 21 dictionaries with English definitions that include the word simultaneously:
Click on the first link on a line below to go directly to a page where "simultaneously" is defined.

General (19 matching dictionaries)

1. simultaneously: Merriam-Webster.com [home, info]
2. simultaneously: Oxford Dictionaries [home, info]
3. simultaneously: Collins English Dictionary [home, info]
4. simultaneously: Vocabulary.com [home, info]
5. Simultaneously, simultaneously: Wordnik [home, info]
6. simultaneously: Cambridge Advanced Learner's Dictionary [home, info]
7. simultaneously: Wiktionary [home, info]
8. simultaneously: Dictionary.com [home, info]
9. simultaneously: UltraLingua English Dictionary [home, info]
10. simultaneously: Cambridge Dictionary of American English [home, info]
11. Simultaneously: Wikipedia, the Free Encyclopedia [home, info]
12. simultaneously: Rhymezone [home, info]
13. simultaneously: Free Dictionary [home, info]
14. simultaneously: Mnemonic Dictionary [home, info]
15. simultaneously: WordNet 1.7 Vocabulary Helper [home, info]
16. simultaneously: LookWAYup Translating Dictionary/Thesaurus [home, info]
17. simultaneously: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

18. simultaneously: Legal dictionary [home, info]

Computing (1 matching dictionary)

19. simultaneously: Encyclopedia [home, info]

(Note: See simultaneousness for more definitions.)

Quick definitions from WordNet (simultaneously) ▸ adverb:  at the same instant ("They spoke simultaneously") ▸ Also see simultaneousness ▸ Words similar to simultaneously ▸ Usage examples for simultaneously ▸ Words that often appear near simultaneously ▸ Rhymes of simultaneously ▸ Invented words related to simultaneously