on occasion
on occasion 意为“偶尔”，中间不加冠词，也不用复数，语气偏正式。
We still meet for lunch on occasion.
我们偶尔还会一起吃午饭。
时候；时刻
occasions — plural of occasion
特殊场合；重大活动；机会；时机；原因；理由；动机；需要；必要；有利的机会；方便或及时的时机。
a particular time when something happens
有利的机会；方便或及时的时机。
A favorable opportunity; a convenient or timely chance.
在关键时刻发生的事件
an event that occurs at a critical time
某事发生的时间。
The time when something happens.
泛指社交活动
a vaguely specified social event
引起某事或反应的事件或情况；动机或原因。
An occurrence or state of affairs which causes some event or reaction; a motive or reason.
理由
reason
导致其他事物发生的事物；起因。
Something which causes something else; a cause.
特定的事件；某事发生的实例或时间。
A particular happening; an instance or time when something occurred.
需要；要求；必要性。
A need; requirement, necessity.
特殊事件或活动。
A special event or function.
理由或借口；动机；说服。
A reason or excuse; a motive; a persuasion.
She wore a beautiful dress for the special occasion.
为了这个特殊场合，她穿了一件漂亮的连衣裙。
用法提示：此句中“occasion”为名词，表示“场合”。
AI contextual example
I would like to take this occasion to thank everyone for their support.
我想借此机会感谢大家的支持。
用法提示：此句中“occasion”为名词，表示“时机”。
AI contextual example
His birthday was the occasion for a small family gathering.
他的生日是一个小型家庭聚会的理由。
用法提示：此句中“occasion”为名词，表示“理由”。
AI contextual example
on occasion 意为“偶尔”，中间不加冠词，也不用复数，语气偏正式。
We still meet for lunch on occasion.
我们偶尔还会一起吃午饭。
表示“在……次情况下”，数词也可换成 several、many 等，occasions 必须用复数。
She has been late on three occasions this month.
这个月她已经迟到过三次了。
occasion 后接 for 加名词或动名词，表示引发或适合某事的机会、场合。
The award ceremony was an occasion for celebration.
颁奖典礼是一个值得庆祝的场合。
have occasion to do sth 表示“有机会、有必要做某事”，多见于否定形式 have no occasion to do。
I've had no occasion to use my passport this year.
今年我一直没有机会用到护照。
event 更通用，可指任何大小事件，occasion 特指有特殊意义或特定的场合。
gathering 强调人们聚集在一起，occasion 可指正式或非正式的聚会，但更侧重场合本身。
affair 常指正式或大型的活动，occasion 涵盖范围更广，包括私人或家庭场合。
celebration 明确带有庆祝意味，occasion 可以指任何事件，不一定有庆祝性质。
function 通常指正式的社会或官方活动，occasion 更日常化。
grammar · medium
易错句子I don't usually drink coffee, but in this occasion I had one.
正确表达I don't usually drink coffee, but on this occasion I had one.
表示“在这个场合、这一次”时，occasion 前要用介词 on（on this occasion、on that occasion、on the occasion of），不能用 in。汉语“在这个场合”中的“在”容易让人直译成 in，但英语把 occasion 看作一个时点或场合，固定搭配是 on，所以应改为 on this occasion。
grammar · medium
易错句子She has visited her grandmother on several occasion this year.
正确表达She has visited her grandmother on several occasions this year.
occasion 是可数名词，前面有 several、many、three 等表数量的词时，必须用复数形式 occasions（on several occasions 意为“好几次”）。汉语名词不区分单复数，容易漏掉词尾 -s，因此要改成 occasions。
偶尔；间或
On occasion, we go to the theater together.
偶尔我们会一起去看戏。
特殊场合；特别活动
This dress is perfect for a special occasion.
这条裙子非常适合特殊场合穿。
在…之际；值此…之时
A speech was given on the occasion of the company's anniversary.
在公司周年庆典上发表了一篇讲话。
挺身应对；表现出色
She really rose to the occasion during the crisis.
她在危机中确实挺身而出，表现出色。
为这个场合；为此
He bought a new tie for the occasion.
他为这个场合买了一条新领带。
正式场合
You should wear a suit to a formal occasion.
在正式场合你应该穿西装。
仪式性场合常伴随典礼活动。
许多重要场合会安排演讲。
特别场合常涉及礼物交换。
场合通常需要邀请他人参加。
某些场合用于纪念重大事件。
偶尔，间或
I like to go for a run on occasion.
我偶尔喜欢去跑步。
挺身而出，应付自如
Despite the pressure, she rose to the occasion and delivered a great speech.
尽管压力很大，她挺身而出，发表了精彩的演讲。
借此机会做某事
He took the occasion to thank his supporters.
他借此机会感谢了他的支持者。
Choose the next layer that will help you use occasions with more confidence.
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.