「一度」の定義と意味 | ブリタニカ辞典

Once Definition & Meaning | Britannica Dictionary The Britannica Dictionary mobile search Home Ask the Editor Word of the Day Quizzes Core Vocabulary Browse the Dictionary × Britannica Homepage Ask the Editor Word of the Day Quizzes Core Vocabulary Browse the Dictionary The Britannica Dictionary once 15 ENTRIES FOUND: once (adverb) once (noun) once (conjunction) once–over (noun) again (adverb) all (pronoun) bite (verb) blue moon (noun) every (adjective) for (preposition) more (adverb) shy (adjective) time (noun) while (noun) young (adjective) 1 once / ˈ wʌns/ adverb 1 once / ˈ wʌns/ adverb Britannica Dictionary definition of ONCE 1 : one time only I will repeat the question once . We try to get together (at least) once every month. The play was performed only once . He had ridden a horse only once (before). We go to the movies once or twice a month. [=we go to the movies a few times a month] I've only seen her once or twice . [=I have only seen her a few times] [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 2 : at any one time : ever She didn't once thank me. He didn't look at me once . [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 3 : at some time in the past It was once done that way. A river once flowed through this canyon. It was once a booming mining town. Their music was once very popular. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples — sometimes used in combination a once- successful actor a once -popular restaurant [+] more examples [-] hide examples [+] Example sentences [-] Hide examples once again/more : for another time : one more time : again Let me explain the problem once again . Once again , you've ignored my instructions. Could I hear the question once more ? [+] more examples [-] hide examples [+] Example sentences [-] Hide examples once and for all : now and for the last time Let's settle this problem once and for all . Winning its fourth straight championship game, the team proved once and for all that they are the best. I'm asking you once and for all . Please, once and for all , stop worrying. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples once bitten, twice shy — see 1 bite once in a blue moon — see blue moon once in a while : sometimes but not often : occasionally We spend most of our time at home and go out once in a while . Every once in a while , we have wine with dinner. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples once upon a time : at some time in the past He was a famous actor once upon a time . [+] more examples [-] hide examples [+] Example sentences [-] Hide examples ◊ Once upon a time is the traditional way to begin a fairy tale. Once upon a time , there was a beautiful princess named Snow White. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 2 once / ˈ wʌns/ noun 2 once / ˈ wʌns/ noun Britannica Dictionary definition of ONCE [ noncount ] : one single time I have tried Indian food more than once . Please be on time just this once . For once you seem to know what I'm talking about. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples at once 1 : at the same time two people talking at once The book is at once [= both ] funny and sad. She had several projects going on all at once . [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 2 : right away : without delay : immediately We need to leave at once . You can call the office and get advice at once . [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 3 once / ˈ wʌns/ conjunction 3 once / ˈ wʌns/ conjunction Britannica Dictionary definition of ONCE : at the moment when : as soon as Things got better once he found a job. = Once he found a job, things got better. Once she spoke, I recognized her. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples ASK THE EDITOR Which word should I use after essential , for or to ? See the answer » QUIZZES Vocabulary Quiz Test your word power Take the Quiz » Name That Thing Take our visual quiz Test Your Knowledge » WORD OF THE DAY concrete : a hard, strong material that is used for building and made by mixing cement, sand, and broken rocks with water Learn More » About Us & Legal Info Contact Us Privacy Notice Terms of Use Pronunciation Symbols Help d="M0 12c0 5.123 3.211 9.497 7.73 11.218-.11-.937-.227-2.482.025-3.566.217-.932 1.401-5.938 1.401-5.938s-.357-.715-.357-1.774c0-1.66.962-2.9 2.161-2.9 1.02 0 1.512.765 1.512 1.682 0 1.025-.653 2.557-.99 3.978-.281 1.189.597 2.159 1.769 2.159 2.123 0 3.756-2.239 3.756-5.471 0-2.861-2.056-4.86-4.991-4.86-3.398 0-5.393 2.549-5.393 5.184 0 1.027.395 2.127.889 2.726a.36.36 0 0 1 .083.343c-.091.378-.293 1.189-.332 1.355-.053.218-.173.265-.4.159-1.492-.694-2.424-2.875-2.424-4.627 0-3.769 2.737-7.229 7.892-7.229 4.144 0 7.365 2.953 7.365 6.899 0 4.117-2.595 7.431-6.199 7.431-1.211 0-2.348-.63-2.738-1.373 0 0-.599 2.282-.744 2.84-.282 1.084-1.064 2.456-1.549 3.235C9.584 23.815 10.77 24 12 24c6.627 0 12-5.373 12-12S18.627 0 12 0 0 5.373 0 12"> © 2026 Encyclopædia Britannica, Inc.