Belonging to the top tier: elite, prestigious.

Top level, top rank, top standing. / Elite.

Having or consisting of two tiers. / (labor) Relating to the two-tier system, a payroll system in which one group of workers receives lower wages and/or benefits than another.

Alternative spelling of top tier

An area in New York, variously described, but approximately comprising the state's counties that border Pennsylvania, except Sullivan County.

Having three tiers

A type of moth; Acleris semipurpurana

(computing) The automatic movement of data between storage locations based on how often it has been accessed, in order to optimize performance.

Having three tiers.

Alternative spelling of multitier