an area that includes places where several people can sit
"there is seating for 40 students in this classroom"
the service of ushering people to their seats
"The seating at the theater was excellent because the staff quickly and politely escorted everyone to their assigned rows."
The act of one that seats.
"The seating of the new governor took place in a crowded hall filled with dignitaries."
In plain English: Seating is the number of chairs available for people to sit on at once.
"The seating in this theater is very comfortable for long movies."
present participle of seat
"The students were seated in rows while the teacher took attendance."
In plain English: To seat someone means to help them sit down in a chair or other place where they can rest comfortably.
"The concert hall is currently seating three hundred guests for the evening show."