AT ONCE meaning: Immediately, without any delay intervening

We found 19 dictionaries that define the word at once:

General (16 matching dictionaries)

at once: Merriam-Webster
at once: Oxford Learner's Dictionaries
at once: Collins English Dictionary
at once: Vocabulary.com
at-once, at once: Wordnik
at once: Cambridge Advanced Learner's Dictionary
at once: Wiktionary
At once, at once: Dictionary.com
at once: Rhymezone
at once: MyWord.info
at once: FreeDictionary.org
at once: Mnemonic Dictionary
at once: TheFreeDictionary.com
at once: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

at once: Legal dictionary

Computing (1 matching dictionary)

at once: Encyclopedia

Miscellaneous (1 matching dictionary)

at once: Idioms

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Definitions from Wiktionary (at once)

▸ adverb:  (obsolete) In one group; together.
▸ adverb:  At the same time; simultaneously; together.
▸ adverb:  Immediately; now; right away.

Opposite:

later, afterward, subsequently

Types:

simultaneously, concurrently, coincidentally, contemporaneously, more...

Phrases:

all at once, Everything Everywhere All at Once, How Can You Be in Two Places at Once When You're Not Anywhere at All, Be Good to Yourself at Least Once a Day, two things at once, more...

Adjectives:

abreast, passim, all, end-to-end, temporary, one-stop, every other, how long, overall, instantaneous, all-inclusive

Colors:

red, blue, green, yellow, orange, more...

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