This is the 3090th most frequent Arabic word.
الخمسة
"The five."
الخمسة refers to the numeral five modifying the noun كتب (books), making it mean 'the five books'.
اشتريت الخمسة كتب التي كنت أحتاجها.
I bought the five books I needed.
الخمسة here acts as an appositive clarifying the subject, equivalent to 'the five of us' in English.
كنا الخمسة أصدقاء نجتمع يوم الجمعة.
We, the five friends, used to meet on Fridays.
الخمسة describes the duration in minutes, with دقائق (minutes) being the noun it modifies, constructing the time expression 'the five minutes'.