tier noun - Definition, pictures, pronunciation and usage notes
https://www.oxfordlearnersdictionaries.com/us/definition/english/tier
WEBone of several levels in an organization or a system. We have introduced an extra tier of administration. Definition of tier noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
DA: 22 PA: 6 MOZ Rank: 60