Happening or appearing once every two weeks, or an adjective describing something that occurs every 14 days.
From 'fortnight' (Old English 'feowertiene niht' meaning 'fourteen nights'), combined with the suffix '-ly' to indicate frequency or regularity. The word evolved from Germanic roots to describe the specific two-week period common in English-speaking cultures.
Before smartphones and weekly schedules, 'fortnight' was a genuinely practical unit of time for planning—two weeks is exactly when a worker's wages would arrive or a servant's day off would cycle around. It's still used in Britain and Commonwealth countries way more than in America, making it a fascinating linguistic divide!
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