Meaning of “tier” in the English Dictionary

"tier" in British English

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tiernoun [ C ]

uk /tɪər/ us /tɪr/

one of several layers or levels:

We sat in one of the upper tiers of the football stands.
My wedding cake had four tiers, each supported by small pillars.
I don't understand why you think we need yet another tier of management.

tierverb [ T often passive ]

uk /tɪər/ us /tɪr/

(Definition of “tier” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"tier" in American English

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tiernoun [ C ]

us /tɪər/

one of several layers or levels:

We sat in one of the upper tiers of the stadium.

(Definition of “tier” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"tier" in Business English

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tiernoun [ C ]

uk /tɪər/ us

one of several levels of importance, quality, etc.:

Only the upper tier of investors profits from the current economy.
bottom/higher/middle tier

MANAGEMENT one of the levels of management in an organization:

The redundancies will only affect the top three tiers of management.

(Definition of “tier” from the Cambridge Business English Dictionary © Cambridge University Press)