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adv(1)(僅僅)一次(one time only)：～a day/a week/a year 一天/周/年一次;～bitten，twice shy (prov) 一朝被蛇咬，十年怕井繩;He'd met her only～but he remembered her.他只見過她一次，卻記住了她。Some trees only bear fruit～every twenty years.有些樹20年才結(jié)一次果。We've been to Europe～.我們?nèi)ミ^一次歐洲?！挤础絥ever，numerously，regularly;

(2)一度，曾經(jīng);過去，從前(at a time in the past;formerly)：I～wanted to be a doctor.我曾經(jīng)想當醫(yī)生。She was～my best friend.她曾是我最好的朋友。O～dinosaurs walked on these plains.從前恐龍曾在這片荒原上行走。This detective story was～very popular but nobody reads it today.這部偵探小說從前很受歡迎，可是現(xiàn)在沒有人看了。I was a little kid～too.我也曾是個小孩子?！纪絝ormerly，previously;〖反〗hereafter;

(3)根本，即使一次(ever;at all，even for one time)(同于neg或interr)：I have not seen him here～.我在這里一次也沒見到過他。Don't～leave today's work for tomorrow.今日事，今日畢。

all at once 突然：All at～he leaped to his feet.他突然跳了起來。

at once 1)立刻(即)，馬上：Come here at～! 馬上到這兒來! 2)同時：Everything happened at～.所有的事都一起發(fā)生了。

(just) for once;just this once 僅此一次，下不為例：He doesn't usually allow people to leave work early but he'll let you do it just for～.他通常不準許員工早退，但這次他破例讓你早走。

get/give sb/sth the once-over 粗略檢查或察看：I haven't got much time but I'll give your report the～-over.我時間不多，但我會大致看一看你的報告。

once again;once more 再一次：If you're late～again，you'll lose your job.如果你再遲到的話，就會失去你的工作。

once and for all 一勞永逸地，永遠地，徹底地：We have decided to settle the matter～and for all.我們決定一勞永逸地解決這個問題。

once in a blue moon 極少，從不(infml)： Coin collecting is interesting，but you find a valuable coin only～in a blue moon.集硬幣很有趣，但是發(fā)現(xiàn)有價值的硬幣卻是難上難。

(every) once in a while 偶爾，間或：They go out together～in a while but not very often.他們偶爾一起出去，但不是很經(jīng)常。

once or twice 一兩次：I don't really know him — I've only met him～or twice.我不大認識他，我只見過他一兩次。

once too often 多次幸免(成功)這次遭殃(受挫)：He exceeded the speed limit～too often and was fined.他再次超速開車，這次被罰了款。

once upon a time 從前……;古時候……(用于童話故事開頭)：O～upon a time there was a king whose name was Miles... 從前有一個國王名叫邁爾斯……

conj 一旦;一……就……(as soon as;when)：O～you began you could not stop.你一旦開始就不能停止。O～you've learned the method it will be easy.你一旦學會了方法，就會很容易。

n 這一次;一次(the one time;on one occassion)(infml)[U，the/this～]：O～is enough.一次足矣。You must be patient;just this～.你一定要耐心，就這一次。I met her just the～.我見到她僅此一次。