fortnight
n.a period of two weeks. It is a common way to talk about time in British English.
n.a period of fourteen days or two weeks. Common in British and Commonwealth English; largely absent from North American usage.
“We are going on holiday for a fortnight.”
“The project team meets every fortnight to discuss their progress and set new goals for the next two weeks.”
“The publication is released once a fortnight, allowing the editorial team sufficient time to conduct deep investigative research between issues.”
Commonly used with the prepositions 'in' or 'for'.
Usage fortnight ago
“In that regard the family was fortunate – they only had to wait a fortnight to get the results.”
“Karović told the Guardian less than a fortnight after the incident that he did not remember much but had a painful head and neck.”
From Middle English fourtenyght, fourtene nyght, from Old English fēowertīene niht (literally “fourteen nights"; the Anglo-Saxons counted by nights), equivalent to fourteen + night. Compare sennight.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.