What is the Latin word for autumnal?

The usual Latin words for “autumnal” are auctumnālis, auctumnus. The right choice depends on the sense; see the distinctions below.

English → Latin

“autumnal” in Latin

auctumnālisautumnal auctumnusautumn

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

autumnal

auctumnalis, or genitive auctumni. The autximnal equinox, aequinoctium auctumnale or auctumni. Autumnal or autumn weather, tempestas auctumnalis or auctumni; caelum auctumnale. The weather is growing autumnal, aestas auctumnescit (Marc. Cap.); aer auctumnat (Plin.).

Quick answer

What is the Latin word for autumnal?: The usual Latin words for “autumnal” are auctumnālis, auctumnus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.