noun, adverb Archaic.
Examples from the Web for yestereve
And as for that letter; a Lenten jest I called it yestereve; and so it is verily!
Stranger, are you going to tell me about yoursel, as I asked you yestereve?The Snow-Burner|Henry Oyen
Not long after dinner Akusch came to me with the tidings that Herdegen had ridden into Nuremberg yestereve.