Definition of tier noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//tɪə(r)//
    ; NAmE NAmE//tɪr//
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  1. 1a 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
  3. Word Originlate 15th cent.: from French tire ‘sequence, order’, from tirer ‘elongate, draw’.Extra examples plans to create a third tier of management the lower tier of government The seating is arranged in tiers.
See the Oxford Advanced American Dictionary entry: tier