tier1 «tihr», noun, verb.
–n.
one of several rows one above another: »
tiers of seats in a football stadium.
–v.t., v.i.
to arrange, or be arranged, in tiers.
╂[< Middle French tire, Old French, rank, sequence, order < tirer to draw.]
ti|er2 «TY uhr», noun.
a person or thing that ties.
Useful english dictionary. 2012.