hmmm, no existe en español; decimos 2 semanas...

We say "quincena" for fortnight. quincenal = fortnightly biweekly = bisemanal

Well, actually there is a word. It's "Quincena":) (/keen-zen-nah/) Literally, it means 15 days:) Buuuut, it is used to refer to a period of two weeks:) For example, "pago quincenal" is a payment you get every 2 weeks:) But of course, you can just use "2 semanas" like Marcos said:)

quincena o quince días,that is to say 15 days.:)

if you want to know it, the day after tomorrow is "pasado mañana"