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

tier

noun
 
/tɪə(r)/
 
/tɪr/
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  1. a row or layer of something that has several rows or layers placed one above the other
    • a wedding cake with three tiers
    • in tiers The seating is arranged in tiers.
  2. one of several levels in an organization or a system
    • We have introduced an extra tier of administration.
    • a two-tier system of management
    • the lower tier of government
  3. Word Originlate 15th cent.: from French tire ‘sequence, order’, from tirer ‘elongate, draw’.
See tier in the Oxford Advanced American Dictionary
hat-trick
noun
 
 
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