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We found 20 dictionaries with English definitions that include the word at once:
Click on the first link on a line below to go directly to a page where "at once" is defined.

General (17 matching dictionaries)

1. at once: Merriam-Webster.com [home, info]
2. at once: Oxford Dictionaries [home, info]
3. at once: Collins English Dictionary [home, info]
4. at once: Vocabulary.com [home, info]
5. at-once, at once: Wordnik [home, info]
6. at once: Cambridge Advanced Learner's Dictionary [home, info]
7. at once: Wiktionary [home, info]
8. At once, at once: Dictionary.com [home, info]
9. at once: Rhymezone [home, info]
10. at once: MyWord.info [home, info]
11. at once: Free Dictionary [home, info]
12. at once: Mnemonic Dictionary [home, info]
13. at once: WordNet 1.7 Vocabulary Helper [home, info]
14. at once: LookWAYup Translating Dictionary/Thesaurus [home, info]
15. at once: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

16. at once: Legal dictionary [home, info]

Computing (1 matching dictionary)

17. at once: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

18. at once: Idioms [home, info]

Quick definitions from WordNet (at once) ▸ adverb:  simultaneously ▸ adverb:  without delay or hesitation; with no time intervening ▸ Words similar to at once ▸ Usage examples for at once ▸ Words that often appear near at once ▸ Rhymes of at once ▸ Invented words related to at once