tier

tier¹ n. [countable]

one of a series of rows that rise one behind or above another, as of seats in a theater.
a layer;
level;
stratum:a wedding cake with six tiers.

tier¹ n.

one of a series of rows or ranks rising one behind or above another, as of seats in an amphitheater, boxes in a theater, guns in a man-of-war, or oars in an ancient galley.
one of a number of galleries, as in a theater.
a layer;
level;
stratum:The wedding cake had six tiers. All three tiers of the firm's management now report to one director.
[Australian.]a mountain range.

v.t.

v.i.

Gmc; compare Old English, Old Saxon tīr, Old High German zēri glory, adornment
Middle French, Old French tire, tiere order, row, rank
earlier also tire, tyre, teare 1560–70

ti•er² n.

Collins Concise English Dictionary © HarperCollins Publishers::

tier /tɪə/ n

one of a set of rows placed one above and behind the other, such as theatre seats
- a layer or level
- (in combination): a three-tier cake

Etymology: 16th Century: from Old French tire rank, of Germanic origin; compare Old English tīr embellishment

tier /ˈtaɪə/ n

'tier' also found in these entries (note: many are not synonyms or translations):

Collocations: that [medical school, college] is top tier, from tier to tier, from one tier to another, more...

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