1.Definition: a relative position or degree of value in a graded group

Related Noun(s):grade, level

Category: General

2.Definition: a worker who ties something

Related Noun(s):tier up

Category: People

3.Definition: any one of two or more competitors who tie one another

Category: People

4.Definition: one of two or more layers one atop another

"Tier upon tier of huge casks", "A three-tier wedding cake"

Category: Objects

5.Definition: something that is used for tying

"The sail is fastened to the yard with tiers"

Category: Objects