This is the 1337th most frequent Arabic word.
أنت
"You" (singular).
The word 'أنت' is used here as a direct pronoun for the second person singular, nominative case.
أنت طالب مجتهد.
You are a diligent student.
In this case, 'أنت' remains a second person pronoun but with the explicit masculine suffix to address a male.
هل أنتَ مستعد للرحلة؟
Are you ready for the trip?
Here, 'أنت' is emphasized with a suffix for contrast and definitiveness in the sentence structure.