a row or levels of a structure, typically one of a series of rows placed one above the other and successively receding or diminishing in size[in combination] 一排;一层 a tier of seats. 一排座位。 the room was full of three-tier metal bunks. 房间里摆满了三层金属床。 ■one of a number of successively overlapping ruffles or flounces on a garment (衣服的)一层褶裥(或荷叶边) ■a level or grade within the hierarchy of an organization or system 阶层;等级 companies have taken out a tier of management to save money. 公司已经撤销了一个管理层以省钱。
派生 tiered adjective 语源
late 15th cent.: from French tire 'sequence, order', from tirer 'elongate, draw'