tier

tier /t'ɪər/ (tiers)
1 [N-COUNT] oft N of n
A tier is a row or layer of something that has other layers above or below it.
...the auditorium with the tiers of seats around and above it.
[COMB in ADJ]
Tier is also a combining form.
...a three-tier wedding cake.
2 [N-COUNT] oft N of n
A tier is a level in an organization or system.
Islanders have campaigned for the abolition of one of the three tiers of municipal power on the island.
[COMB in ADJ]
Tier is also a combining form.
...the possibility of a two-tier system of universities.

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