Definition of "autumn" in English

noun

1. 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.

   • autumn leaves

2. (by extension) The time period when someone or something is past its prime.

3. (fashion) A person with relatively dark hair and a warm skin tone, seen as best suited to certain colours in clothing.

verb

1. (intransitive) To spend the autumn (in a particular place).

2. (ambitransitive) To (cause to) undergo the changes associated with autumn, such as leaves changing color and falling from trees.