autumn
In British English, autumn or the autumn is the season between summer and winter.
Saturday was the first day of autumn.
The vote will take place in the autumn.
If you want to say that something happens every year during this season, you say that it happens in autumn or in the autumn.
In autumn the berries turn orange.
Birth rates are lowest in the autumn.
Be careful
Don't say that something happens ‘in the autumns’.
Don't say that something happens ‘in the autumns’.
In American English, autumn is referred to as the fall.
In the fall we are going to England.