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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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