This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, relating to, or occurring in the evening.

adj. Botany Opening or blooming in the evening.

adj. Zoology Becoming active in the evening, as bats and owls; crepuscular.

adj. Occurring in or related to the evening.

adj. Pertaining to animals which are principally active at dusk.

adj. Pertaining to plants which open or bloom in the evening.

adj. Of or pertaining to the evening; happening or being in the evening.

adj. Blossoming in the evening.

In astrology, setting after the sun: said of a planet.

Of or pertaining to the evening; happening or being in the evening.

In botany, opening in the evening, as a flower.

[capitalized] In geology, noting one of Prof. H. D. Rogers's divisions of the Paleozoic series in Pennsylvania.

In zoology, crepuscular; flying or otherwise specially active in the twilight of evening, as an insect, a bat, or a bird: as, the vespertine or evening grosbeak, Hesperiphona vespertina.

In astronomy, descending from the meridian to the horizon at the time of sunset.

"I cringed away from the man, from the way he looked at me—now patiently, as if encouraging a slow learner; now furiously; now with a pregnant, vespertine calm."