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[wʌns]

adv. 一次;曾经,昔时 
conj. 一旦…就… 
n. (口)一次,一回 

来源于中古英语one的所有格ones,词尾变化时为了保留末尾的辅音。

拆分: one一 + e脱落 + -ce副词词尾  

短语:
all at once 突然,同时 
at once 立刻,马上;同时 
for oncethis once 就这一次,破例一回 
once a ..., always a ... (谚)一次始终… 
once again 又一次,再一次 
once and for all once for all 一劳永逸,彻底地 
once upon a time 从前(用于故事的开头),曾经 
once or twice 一两次,几次
once in a while 偶尔,间或
once againonce more 又一次,再次 
for oncejust this once 仅此一次

例:
All at once the noise stopped. 突然,吵闹声停止了。 
A lot of beans are ready all at once. 同时很多豆子准备好了。 
I fell asleep at once. 我马上就睡着了。 
Computers that can do many things at once. 可以同时做很多事的电脑 
I hope you'll forgive me this once. 我希望你就原谅我这一次。 
Once a whinger, always a whinger. 曾经是把短刀,始终是把短刀。 
Once a teacher, always a teacher. 一朝为师,永远为师。 
Once upon a time in a faraway land there lived a princess in a big castle. 从前,在很远的地方,有一位美丽的公主住在一座很大的城堡里。 
Once upon a time she would have been jealous, but no longer. 她曾经嫉妒心很强,不过现在不了。 
I don’t know her well, I’ve only met her once or twice. 我跟她不很熟,我只见过她一两次。 
We go to the theatre once in a while, but there’s not much worth seeing. 我们偶尔去剧院看戏,不过没什么太值得看的节目。 
I’ve decided once and for all that this city is not the place for me. 我最终认识到这个城市不适合我。 
Once again the train was late. 火车又一次晚点了。 
Let me hear it just once more. 让我再听一遍。
Try and get here on time for once, will you? 就这一次,你能不能按时到呢?  
Can’t you two be nice to each other just this once? 难道你们俩就这一次也不能彼此和睦一点? 
Once bitten, twice shy. 一朝被蛇咬,十年怕井绳。