This is the 4084th most frequent Arabic word.
خمسة
"خمسة" means "five" in English.
In this sentence, the word 'خمسة' (five) is used as a cardinal number to indicate the quantity of books purchased.
اشتريت خمسة كتب جديدة.
I bought five new books.
Here, 'خمسة' (five) is used to denote the hour in a time-telling context, making it an ordinal reference cojoined with the term for 'o'clock'.
بدأ اللقاء عند الساعة الخامسة مساءً.
The meeting started at five o'clock in the evening.
In this sentence, 'الخامسة' (fifth) is the feminine ordinal form of 'خمسة', referencing the sequence of attempts numerically.