Plural form of fortnight; multiple periods of two weeks or 14 days each.
Simple plural of 'fortnight' by adding the standard English '-s' suffix. The singular 'fortnight' comes from Old English 'feowertiene niht' (fourteen nights), and the plural maintains this ancient structure.
The phrase 'a fortnight' sounds almost Shakespearean to modern ears, but it's simply the most efficient way English-speakers found to say '14 days'—using nights instead of days because people historically counted time by dark periods for work cycles and travel planning.
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