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tier

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Noun tier has 5 senses
  1. grade, level, tier - a relative position or degree of value in a graded group; "lumber of the highest grade"
    --1 is a kind of rank
    --1 has particulars: biosafety level; A level; O level; college level
  2. tier - any one of two or more competitors who tie one another
    --2 is a kind of
    rival, challenger, competitor, competition, contender
    Derived form: verb tie2
  3. tier, tier up - a worker who ties something
    --3 is a kind of worker
    Derived form: verb tie1
  4. tier - something that is used for tying; "the sail is fastened to the yard with tiers"
    --4 is a kind of
    rope
    Derived form: verb tie1
  5. tier - one of two or more layers one atop another; "tier upon tier of huge casks"; "a three-tier wedding cake"
    --5 is a kind of
    layer, bed
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