third-order

Translations
третьего порядка
третьего уровня
третьей степени
Definitions
Of or relating to the third level, rank, or position in a sequence or hierarchy.
In mathematics, involving a third derivative, a differential equation of order three, or a polynomial of degree three.
In a scientific or technical context, involving terms, effects, or approximations of the third order.
Words
third

adjective
третий
order

noun
порядок