EVE

(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

The day before

Example: "He always arrives on the eve of her departure"

The period immediately before something

Example: "On the eve of the french revolution"

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

Example: "He enjoyed the evening light across the lake"