Also means
inside of (a period)
Usage Note
binnen is a formal preposition meaning within a span of time, taking the dative (or genitive): binnen einer Woche. It belongs to written and legal German; everyday speech prefers innerhalb von. It always refers to duration, never to place.
Examples
"Die Ware wird binnen drei Tagen geliefert."
Natural Translation
The goods will be delivered within three days.
Literal Translation
The goods are within three days delivered.

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