American English

Definition of tier noun from the Oxford Advanced American Dictionary



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  1. 1 a row or layer of something that has several rows or layers placed one above the other a wedding cake with three tiers The seating is arranged in tiers.
  2. 2one of several levels in an organization or a system We have introduced an extra tier of administration. a two-tier system of management
See the Oxford Advanced Learner's Dictionary entry: tier