(poetic) Of or related to the evening; that occurs in the evening.
1837, William Evans Burton (editor), Philadelphia in the Dog Days: An Incoherency, Burton's Gentleman's Magazine and American Monthly Review, Volume 1: July—December, page 131,
The peripatetics issue forth to indulge in the usual vespertine locomotion; and stroll gently down the aristocratic Chesnut and up the sedate and solid-seeming Mulberry, or vice versa.
(astrology, of a planet or star) That sets after the sun.
(zoology, of an animal) That is principally active at dusk.
(botany) Occurring in the evening.
(botany, of a plant) That opens or blooms in the evening.