jesień

Traditionally the third of the four seasons, when deciduous trees lose their leaves, and temperatures and daylight hours decrease; typically regarded as spanning the months of September, October, and November in the Northern Hemisphere, and the months of March, April and May in the Southern Hemisphere.

Қалай қолдану керек

The noun 'jesień' (autumn / fall) is feminine despite ending in a consonant, and declines as a feminine i-stem (genitive 'jesieni'). To say 'in autumn', use the instrumental case 'jesienią'.