<P> Autumn , also known as fall in American and Canadian English , is one of the four temperate seasons . Autumn marks the transition from summer to winter , in September ( Northern Hemisphere ) or March ( Southern Hemisphere ) , when the duration of daylight becomes noticeably shorter and the temperature cools down considerably . One of its main features is the shedding of leaves from deciduous trees . </P>
what is the meaning of the word autumn
fall