1 one of eighteen equal parts: seventeen eighteenths.
az: on səkkizdə bir 1/18
ru: восемнадцатая часть
2 (also adjective)(the) last of eighteen (people, things etc); (the) next after the seventeenth: He was eighteenth in the competition; the eighteenth floor of the building.
az: on səkkizinci, 18-ci
ru: восемнадцатый