This is the 1895th most frequent Russian word.
посетителей
"Visitors" or "guests."
The word 'посетителей' is the plural form of 'visitor' in the partitive sense, referring to people who attended or visited.
В музее было много посетителей.
There were many visitors in the museum.
Here, 'посетителей' denotes individuals being directly addressed or considered by another party.
Администратор приветствовал посетителей на входе.
The administrator welcomed the visitors at the entrance.
This usage indicates 'посетителей' as recipients of the guide's attention and information.