autumn /ˈɔːtəm/noun 3verb 2forms 3phrases 1 noun3 •the third season of the year, when the weather grows cooler and leaves fall from treesautumn leaves •The time period when someone or something is past its prime.She has beauty still, and if it be not in its heyday, it is not yet in its autumn. — 1853 •A person with relatively dark hair and a warm skin tone, seen as best suited to certain colours in clothing. verb2 •To spend the autumn (in a particular place).If Tad’s father and Tad had wintered, springed, summered, and autumned together for an hundred years instead of fifteen they could[…] — 1912 •To (cause to) undergo the changes associated with autumn, such as leaves changing color and falling from trees.[…]he himself roamed with innocent Kate through the fast autumning woods[…] — 1887 formsautumned · autumning · autumns Phrases with autumn autumn romanceA romantic relationship which occurs in a later stage of life.