A fortnight is two weeks — fourteen nights, if you say it the old way. So fortnightly means once every two weeks.

A fortnight is two weeksfortnight是兩個星期 — fourteen nights, if you say it the old way老式的說法是「十四個晚上」。 So fortnightly means once every two weeks所以fortnightly的意思就是每兩週一次

A fortnightly magazine comes out every other week; a fortnightly meeting happens every two weeks. You can use it before a noun (a fortnightly report) or after a verb (the paper comes out fortnightly).

A fortnightly magazine comes out every other weeka fortnightly magazine（雙週刊）是每隔一週出刊一次; a fortnightly meeting happens every two weeksa fortnightly meeting（雙週會議）則是每兩週開一次。 You can use it before a noun (a fortnightly report)你可以把它放在名詞前面，像a fortnightly report（雙週報告） or after a verb (the paper comes out fortnightly)也可以放在動詞後面，像the paper comes out fortnightly（這份報紙每兩週出刊一次）

British English uses this word quite naturally. American English almost never does; Americans say every two weeks, or biweekly — though biweekly is messy, because some people use it for twice a week.

British English uses this word quite naturally英式英文很自然地會用這個字。 American English almost never does美式英文幾乎不會用; Americans say every two weeks, or biweekly美國人會說every two weeks，或是biweekly — though biweekly is messy, because some people use it for twice a week不過biweekly這個字有點混亂，因為有些人拿它來指「一週兩次」

In Taiwan you will meet fortnightly in British school books and in the names of magazines.

In Taiwan you will meet fortnightly in British school books在台灣，你會在英式教材裡遇到fortnightly這個字, and in the names of magazines也會在雜誌的名字裡看到它