once的讀音是：英[w?ns]。once的詞語用法是conj.(連詞)once用作連詞時可引導時間狀語從句和條件狀語從句。用於前者時意為“壹旦…就…”,所引導的從句多很短; 用於後者時意為“只要”,這種條件從句似帶有時間條件的含意。once的意思是adv.壹次；曾經；conj.壹旦；n.壹次；adj.曾經的。
壹、詳盡釋義點此查看once的詳細內容
adv.(副詞)壹次，壹回曾，曾經，從前，昔日同時根本突然，驟然，忽然壹旦立即，馬上僅此壹次（與通常情況對比而言）最終地conj.(連詞)壹…就 ，壹旦…就… ，壹經...便當…時候，每當n.(名詞)壹次，壹回，壹度adj.(形容詞)從前的，以前的，曾經的壹度的二、英英釋義
Adverb:on one occasion;"once I ran into her"
as soon as;"once we are home, we can rest"
at a previous time;"at one time he loved her"
"her erstwhile writing"
"she was a dancer once"
三、詞典解釋
1.壹次；壹回
If something happensonce, it happens one time only.
e.g. I met Wilmaonce, briefly...
我曾經和威爾瑪有過短短的壹面之緣。
e.g. Since that evening I haven'tonce slept through the night...
從那天晚上之後，我沒有睡過壹次安穩覺。
2.（與後接day, week, month等的a連用）（每…）壹次，（每…）壹回
You useonce with 'a' and words like 'day', 'week', and 'month' to indicate that something happens regularly, one time in each day, week, or month.
e.g. Lung cells die and are replaced aboutonce a week...
肺細胞約每周新老更替壹次。
e.g. We arranged a special social eventonce a year to which we invited our major customers.
我們每年舉辦壹次專門的社交活動，邀請重要客戶出席。
3.（與後接day, week, year等的every連用）（每隔…）壹次，（每隔…）壹回
You useonce with 'every' and words like 'day', 'week', and 'year' to indicate that something happens a specified number of times and on a regular basis.
e.g. The patient was seen for follow-up visitsonce every three months...
這位病人每三個月接受壹次隨訪就診。
e.g. My daughter comes to visit meonce every fortnight.
我女兒每兩周來看我壹次。
4.曾經，壹度（狀況如此）
If something wasonce true, it was true at some time in the past, but is no longer true.
e.g. The culture ministeronce ran a theatre...
這位文化部長曾經經營過壹家劇院。
e.g. I lived thereonce myself, before I got married...
我結婚前曾獨自在那兒住過。
5.曾經（做過某事）
If someoneonce did something, they did it at some time in the past.
once的意思
e.g. Ionce went camping at Lake Darling with a friend...
我曾和壹位朋友在達令湖畔露營。
e.g. Weonce walked across London at two in the morning...
我們曾在淩晨兩點步行穿過倫敦。
6.壹旦…（就…); 壹…（就…）
If something happensonce another thing has happened, it happens immediately afterwards.
e.g. The decision had taken about 10 secondsonce he'd read a market research study...
在他看過壹份市場調研報告後大概10秒鐘就作出了決定。
e.g. Once customers come to rely on these systems they almost never take their business elsewhere...
顧客壹旦依賴上這些系統，幾乎就不會光顧其他商家。
7.突然；忽然
If something happensall at once, it happens suddenly, often when you are not expecting it to happen.
e.g. I feel terribly sleepy all atonce...
我突然覺得特別困。
e.g. All atonce there was someone knocking on the door.
忽然有人敲門。
8.立即；馬上
If you do somethingat once, you do it immediately.
e.g. I have to go, I really must, atonce...
我得走了，我真的必須馬上就走。
e.g. Remove from the heat, add the parsley, toss and serve atonce...
端離爐子，加上歐芹，顛起翻面後就立刻上桌。
9.同時；壹起
If a number of different things happenat once orall at once, they all happen at the same time.
e.g. You can't be doing two things atonce...
不能壹心二用。
e.g. No bank could ever pay off its creditors if they all demanded their money atonce...
如果所有的儲戶同時要求提取存款，沒有哪家銀行能辦得到。
10.就此壹次；破例壹次
For once is used to emphasize that something happens on this particular occasion, especially if it has never happened before, and may never happen again.
e.g. Foronce, dad is not complaining...
爸爸這次破天荒地沒有抱怨。
e.g. His smile, foronce, was genuine.
只有這壹次，他真誠地笑了。
11.又壹次；再次
If something happensonce again oronce more, it happens again.
e.g. Amy picked up the hairbrush and smoothed her haironce more...
埃米拿起發梳，再次將頭發梳理整齊。
e.g. Once again an official inquiry has spoken of weak management and ill-trained workers.
官方調查又壹次提到了管理不力與工人缺乏訓練的問題。
12.徹底地；壹勞永逸地
If something happensonce and for all, it happens completely or finally.
e.g. We have to resolve this matteronce and for all...
我們必須徹底解決這壹問題。
e.g. If we act fast, we canonce and for all prevent wild animals in Britain from suffering terrible cruelty.
如果我們迅速采取行動，就可以壹勞永逸地使英國的野生動物免受殘忍的虐待。
13.偶爾；間或
If something happensonce in a while, it happens sometimes, but not very often.
e.g. Earrings need to be taken out and cleanedonce in a while.
耳環要偶爾取出來清洗壹下。
e.g. Once in a while she phoned him.
她間或會給他打個電話。
14.壹兩次；幾次
If you have done somethingonce or twice, you have done it a few times, but not very often.
e.g. I popped my head round the dooronce or twice...
我有幾次頭撞到了門上。
e.g. Once or twice she had caught a flash of interest in William's eyes...
有那麽壹兩次，她發現威廉的眼睛裏流露出壹絲感興趣的神色。
15.（常用於兒童故事的開頭）從前，很久以前
Once upon a time is used to indicate that something happened or existed a long time ago or in an imaginary world. It is often used at the beginning of children's stories.
e.g. 'Once upon a time,' he began, 'there was a man who had everything.'...
“很久很久以前，”他開始說道，“有這麽壹個人，他應有盡有。”
e.g. Once upon a time, asking a woman if she has a job was quite a straightforward question.
從前，問壹位女性是否有工作是個相當簡單直接的問題。
16. once in a blue moon -> see moon
四、例句
Once or twice she looked over her shoulder at me.
有壹兩次她回頭看看我。
She had not once spoken to him all the evening.
整整壹晚上,她都沒有跟他講過壹次話。
I see them about once a fortnight.
我大約兩星期見他們壹次。
Once we lived in London.
我們曾經住在倫敦。
五、常見句型
用作副詞(adv.)I have been there once.
我到過那兒壹次。I once went around the world.
過去我周遊過全球。用作連詞(conj.)Once you begin, you must continue.
壹旦開了頭,妳就必須繼續下去。Once you have taken the examination, you'll be able to relax.
妳壹旦考過試,就可以輕松壹下了。Once you have promised you must do it.
妳既已答應,就應該去做。Once inside her bedroom, she began to cry.
壹走進臥室,她就哭了。用作名詞(n.)Once is enough for me.
我壹次就夠了。She's only done it the once so don't be too angry.
她只做過這壹次,所以不要太生氣。六、經典引文
Miss Trant read it through once.sssss S. Bedford
出自：ssssJ. B. Priestley七、詞源解說
☆ 直接源自古英語的ane，意為壹。once的相關近義詞
at one time
once的相關臨近詞
oncology、onboard、Oncet、oncer、Onceja、Oncete、Onceriu、Onceanu、Oncescu、onceover、once once、once more
點此查看更多關於once的詳細信息