This is the 676th most frequent Greek word.
πλήρως
Fully; completely.
In this case, "πλήρως" (fully) accentuates the thorough comprehension of the lesson by the student.
Ο μαθητής κατανόησε πλήρως το μάθημα.
The student fully understood the lesson.
Here, "πλήρως" (fully) highlights the team's comprehensive readiness for the match.
Η ομάδα θα είναι πλήρως προετοιμασμένη για τον αγώνα.
The team will be fully prepared for the match.
Here, "πλήρως" (fully) emphasizes the completeness of the organization of the room.