Search Result for "once": Wordnet 3.0. ADVERB (3) 1. on one occasion; - Example: "once I ran into her" [syn: once, one time, in one case] 2. One time only: once a day. Find more ways to say at once, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Definition and synonyms of at once from the online English dictionary from Macmillan Education.. Define once more. Learn more. Meaning of once. OneLook Thesaurus and Reverse Dictionary 18,955,870 words in 1061 dictionaries indexed — Today's word is asio Reverse Dictionary Browse Dictionaries Help 2. Look it up now! Simply copy and paste a list with any delimeter. 3. Once in a lifetime definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Definitions/synonyms are immediately available for viewing, emailing, or downloading. Definition of once. adv. Look up multiple words quickly. Another word for at once. 4. All Free. Define once. What does once mean? Look it up now! Search once it was done and thousands of other words in English definition and synonym dictionary from Reverso. 1. At once definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. 2. One time only: once a day. At one time in the past; formerly. once more synonyms, once more pronunciation, once more translation, English dictionary definition of once more. one - WordReference thesaurus: synonyms, discussion and more. At any time; ever: Once known, his face is never forgotten. Synonyms: for the last time, finally, completely, for good More Synonyms of once and for all See full dictionary entry for once COBUILD Advanced English Dictionary . 1. This is the British English definition of at once.View American English definition of at once.. Change your default dictionary to American English. once definition: 1. one single time: 2. at the same time: 3. used when something happens that does not usually…. once synonyms, pronunciation, spelling and more from Free Dictionary. once synonyms, once pronunciation, once translation, English dictionary definition of once. adv.