Functions as an adjective derived from the past participle of the verb 'level'.
Translations
The levelled surface made it easier to install the tiles.
Ровная поверхность облегчила установку плитки.
The levelled ground was perfect for building the new playground.
Выровненная земля была идеальной для строительства новой детской площадки.
Definitions
Having a flat or even surface. The levelled ground was perfect for setting up the tent.
Having been made equal or uniform. The levelled playing field allowed all competitors to have an equal chance.