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English definition of “tier”

tier

noun [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.Things collected in lines or ringsCoverings and layers

tier

verb [T often passive] uk   /tɪər/ us    /tɪr/
to arrange or organize something in tiers: The seats in the theatre were steeply tiered.Covering and adding layers
-tiered
suffix uk   /tɪəd/ us    /tɪrd/
a two-tiered structure a three-tiered cakeCovering and adding layers
(Definition of tier from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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