tier

noun

• a row or level of a structure, typically one of a series of rows placed one above the other and successively receding or diminishing in size:a tier of seats [in combination]:the room was full of three-tier metal bunks
• one of a number of successively overlapping ruffles or flounces on a garment.
• a level or grade within the hierarchy of an organization or system:companies have taken out a tier of management to save money