From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. The evening before a holiday, -- from the Jewish mode of reckoning the day as beginning at sunset, not at midnight; as, Christmas eve is the evening before Christmas; also, the period immediately preceding some important event. "On the eve of death." --Keble.
From WordNet (r) 3.0 (2006) [wn]:
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Eye and Pyramid BANKING REFORM CHALLENGE