4 ms·From 'fourteen nights' - two weeksby samdb 12y agoFrom 'fourteen nights' - two weeksArnavion 12y agoAnother reason to know what fortnight means is that it enables you to use the word "fortnightly" instead of "bi-weekly." With the latter I never know if the speaker meant "twice a week" or "every two weeks" without a follow-up question.francis88 12y agowill add it soon. Thanks