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English definition of “tier”

tier

noun [C]     /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 .Things collected in lines or ringsCoverings and layers
(Definition of tier noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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