Definition of autumnize in English:

autumnize

Pronunciation /ˈɔːtəmnʌɪz/ /ˈɔːtəmʌɪz/

See synonyms for autumnize

verb

  • To give an autumnal appearance to.

Origin

Early 19th century; earliest use found in John Knapp (1767–1845), botanist. From autumn + -ize.