ярус

Etymology
Of unclear origin. Presumed by J. J. Mikkola to be borrowed from. Compare and. This derivation has however been doubted on phonetic and semantic grounds.

Noun

 * 1) tier horizontal row
 * 2)  circle curved upper tier of seats in a theater
 * 3)  geologic

Etymology
Of unclear origin. See the Russian entry for more information.

Noun

 * 1) tier horizontal row
 * 2)  circle curved upper tier of seats in a theater
 * 3)   succession of rock strata laid down in a single age on the geologic time scale