tier

(noun) a relative position or degree of value in a graded group. Synonyms: grade, level. Examples: "Lumber of the highest grade."

(noun) any one of two or more competitors who tie one another.

(noun) a worker who ties something. Synonyms: tier up.

(noun) something that is used for tying. Examples: "The sail is fastened to the yard with tiers."

(noun) one of two or more layers one atop another. Examples: "Tier upon tier of huge casks." "A three-tier wedding cake."