(~s)
1.
A ~ is a row or layer of something that has other layers above or below it.
...the auditorium with the ~s of seats around and above it.
N-COUNT: oft N of n
•
Tier is also a combining form.
...a three-~ wedding cake.
COMB in ADJ
2.
A ~ is a level in an organization or system.
Islanders have campaigned for the abolition of one of the three ~s of municipal power on the island.
N-COUNT: oft N of n
•
Tier is also a combining form.
...the possibility of a two-~ system of universities.
COMB in ADJ