This is the 2258th most frequent Arabic word.
الثامن
The eighth.
In this sentence, 'الثامن' refers to the ordinal number indicating the eighth level of school grades.
وصلت إلى الصف الثامن في المدرسة.
I reached the eighth grade in school.
Here, 'الثامن' is used as an ordinal number to describe the position of someone in a sequence within a context of a race.
كان الثامن في السباق سريعاً جداً.
The eighth person in the race was very fast.
In this context, 'الثامن' refers to the sequence in a series of movies, denoting the eighth installment.