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tier (n.)

"row, rank, range," mid-15c., from Old French tire (13c.) "rank, sequence, order, kind," also "likeness, image; state, condition," probably from tirer "to draw, draw out" (see tirade).

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Definitions of tier from WordNet

tier (n.)
a relative position or degree of value in a graded group;
Synonyms: grade / level
tier (n.)
any one of two or more competitors who tie one another;
tier (n.)
a worker who ties something;
Synonyms: tier up
tier (n.)
something that is used for tying;
the sail is fastened to the yard with tiers
tier (n.)
one of two or more layers one atop another;
tier upon tier of huge casks
a three-tier wedding cake
From wordnet.princeton.edu