occasion，英语单词，主要用作名词、动词。作名词时意为“时机，机会；场合；理由”，作动词时意为“引起，惹起”等。

英 [əˈkeɪʒ(ə)n] 美 [əˈkeɪʒn]

n. （某事发生的）时刻，时候；<正式>时机，适当的机会；特殊（或重大）场合，特殊（或重大）事件；<正式>理由，原因

v. <正式> 引起，惹起

[ 复数 occasions 第三人称单数 occasions 现在分词 occasioning 过去式 occasioned 过去分词 occasioned ]

柯林斯英汉双解大词典

occasion /əˈkeɪʒən/ CET4 TEM4

1.N-COUNT An occasion is a time when something happens, or a case of it happening. (某事发生的) 时候; 场景

2.N-COUNT An occasion is an important event, ceremony, or celebration. 重大场合

3.N-COUNT An occasion for doing something is an opportunity for doing it. 机会 [正式]

4.PHRASE If you have occasion to do something, you have the opportunity to do it or have a need to do it. 有机会; 有必要

5.PHRASE If you say that someone rose to the occasion, you mean that they did what was necessary to successfully overcome a difficult situation. 应付自如

special occasion 特别的时刻；特别的场合

on the occasion of 值此…之际

on occasion 有时；偶尔

on this occasion adj. 这一次

on one occasion adj. 有一次；曾经， 有一个时候

on that occasion 在那个时机；在那个时候；在那个场合下

rise to the occasion 应付自如

on occasion 间或 ; 有时 ; 不时地 ; 必要时

the grand occasion 盛世 ; 乱世

on the occasion of 其时 ; 请允许我借……的机会

daily occasion 日常场合 ; 日常场所

give occasion to 引起 ; 使发生 ; 惹起

on the happy occasion of 欣逢