(transitive) To prepare (something) for autumn weather. / (transitive) To give the appearance of autumn; to make autumnal.

plural of autumnful

An amount that lasts through or is produced during one autumn season.

autumn / middle age

plural of Autumn

(Britain) The middle of autumn.

(Britain) Happening in the middle of autumn.

(Britain) In the middle of autumn.

(astronomy) The moment when the sun appears to cross the celestial equator while tilting away from the observer, taking place in September in the northern hemisphere and March in the southern hemisphere.

autumnal equinox