/ˈɔ:təm ||; ˈɔtəm/(US usually 美通常作 fall) noun [C,U] the season of the year that comes between summer and winter 秋天；秋季: In autumn the leaves on the trees begin to fall. 秋天，树叶开始落下。 ☞picture at season 见season插图 ➔autumnal /ɔ:ˈtʌmnəl ||; ɔˈtʌmnḷ/ adj