fortuitous
adjective formal uk/fɔːˈtʃuː.ɪ.təs/ us/fɔːrˈtuː.ə.t̬əs/
（有利的事）偶然发生的，碰巧的
(of something that is to your advantage) not planned, happening by chance
The timing of the meeting is certainly fortuitous. 这次会议的时机真是太巧了。
The collapse of its rivals was a fortuitous opportunity for the company. 竞争对手的倒闭给这家公司带来了意外的机会。