Definition of "Eve" :

noun: (Old Testament) Adam's wife in Judeo-Christian mythology: the first woman and mother of the human race; God created Eve from Adam's rib and placed Adam and Eve in the Garden of Eden

noun: the day before

"He always arrives on the eve of her departure."

noun: the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)

"He enjoyed the evening light across the lake."

noun: the period immediately before something

"On the eve of the French Revolution."