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English definition of “tier”

tier

verb [T often passive]     /tɪər/ US  /tɪr/
to arrange or organize something in tiers: The seats in the theatre were steeply tiered.Covering and adding layers -tiered     /tɪəd/ US  /tɪrd/ suffix a two-tiered structure a three-tiered cakeCovering and adding layers
(Definition of tier verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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