aseasonal

Etymology tree
English a-
French a-
Proto-Indo-European *ser-der.
Proto-Italic *serō
Latin serō
Proto-Indo-European *-tis
Proto-Indo-European *-Hō
Proto-Indo-European *-tiHō
Proto-Italic *-tiō
Latin -tiō
Latin satiōnem
Old French saison
French saison
Proto-Italic *-āzi
▲
Latin -ereinflu.
Latin -āre
Old French -ier
Middle French -er
French -er
French assaisonnerbor.
English season
Proto-Indo-European *h₂el-der.?
Proto-Italic *-ālis
Latin -ālisbor.
Old French -albor.
▲
Latin -ālis
Old French -elbor.
▲
Latin -ālisbor.
Middle English -al
English -al
English seasonal
English aseasonal
From a- + seasonal.