| Noun | 1. | tier - a relative position or degree of value in a graded group; "lumber of the highest grade"biosafety level - the level of safety from exposure to infectious agents; depends on work practices and safety equipment and facilities rank - relative status; "his salary was determined by his rank and seniority" A level - the advanced level of a subject taken in school (usually two years after O level) O level - the basic level of a subject taken in school college level - the level of education that college students are assumed to have attained | |
| 2. | tier - any one of two or more competitors who tie one another | |
| 3. | tier - a worker who ties somethingworker - a person who works at a specific occupation; "he is a good worker" | |
| 4. | tier - something that is used for tying; "the sail is fastened to the yard with tiers" | |
| 5. | tier - one of two or more layers one atop another; "tier upon tier of huge casks"; "a three-tier wedding cake"layer, bed - single thickness of usually some homogeneous substance; "slices of hard-boiled egg on a bed of spinach" | |