fortuitous

a. 偶然的
【医】 偶然的, 机会的

名词:fortuitousness 副词:fortuitously 

for.tu.i.tous

adj.（形容词）
Happening by accident or chance.See Synonyms at accidental
偶然发生的：因某种事件或机会而发生参见 accidental
Usage Problem
【用法疑难】
Happening by a fortunate accident or chance.
幸运地发生的：因某种幸运事件或机会而发生的
Lucky or fortunate.
幸运的，好运的

来源：
Latin fortuotus
拉丁语 fortuotus
from forte [by chance] [ablative of] fors [chance]
源自 forte [偶然的] [] fors的夺格 [机会]

【引伸】
fortu.itously
adv.（副词）
fortu.itousness
n.（名词）
In its best-established sense,fortuitous means .happening by accident or chance,. with no implication as to the desirability of the outcome:a fortuitous meeting may have either fortunate or unfortunate consequences. In this century, however, the word is often used with particular reference to happy accidents,as inThe company`s third-quarter profits were enhanced as the result of a fortuitous drop in the cost of RAM chips. This use may have arisenbecausefortuitous resembles both fortunate and felicitous; it is well established in the writing of reputable authors.More controversial is the use offortuitous to mean simply .lucky or fortunate,. as inHe came to the Giants in June as the result of a fortuitous trade that sent two minor-league players to the Reds` organization. This use dates back at least to the 920`s,when H.W. Fowler labeled it a malaproprism.It is still widely regarded as incorrect,and writers who are unwilling to risk censure are advised to avoid it.
从最公认的意义上说，fortuitous 的意思是.偶然发生的.， 不暗示结果是否称心：临时会议 可以有好或坏的结果。 然而在本世纪这个词常用于专指好的事件，如内存条价格的意外下降导致了公司第三季度利润的增加。 这种用法可能出现，因为fortuitous 类似于 fortunate 和 felicitous； 它用于有名望的作家的写作中。更有争论的用法是fortuitous 的含义为.幸运的或好运的.时， 如一次幸运的送两名小社团的运动员去红色组织的交易使他在六月去了巨人国。 这种用法至少可追溯到20世纪20年代，当时H.W.弗劳尔把它标作一个可笑的用法错误。现在这种用法仍被广泛地认为是错误的，建议不愿冒险受指责的作者避免使用