Noun
1. a relative position or degree of value in a graded group;
"lumber of the highest grade"2. any one of two or more competitors who tie one another
3. a worker who ties something
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"