Noun – Eve
(count)
1 literary : EVENING
one pleasant summer’s eve
“…from noon to dewy eve…” — John Milton, Paradise Lost (1667)
2 : the evening or the day before a special day — usually singular
New Year’s Eve
Christmas Eve
3 : the period of time just before an important event — used in the phrase on the eve of
The students were nervous on the eve of their graduation.