Tier - Definition

n 1: a relative position or degree of value in a graded group;
"lumber of the highest grade" [syn: grade, level,
tier]
2: any one of two or more competitors who tie one another
3: a worker who ties something [syn: tier, tier up]
4: something that is used for tying; "the sail is fastened to
the yard with tiers"
5: one of two or more layers one atop another; "tier upon tier
of huge casks"; "a three-tier wedding cake"