From the same as opiso (through the idea of backwardness); (adverbially) late in the day; by extension, after the close of the day -- (at) even, in the end.
KJV: And Jesus entered into Jerusalem, and into the temple: and when he had looked round about upon all things, and now the eventide was come, he went out unto Bethany with the twelve.
NASB: Jesus entered Jerusalem and came into the temple; and after looking around at everything, He left for Bethany with the twelve, since it was already late.
KJV: Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning:
NASB: "Therefore, be on the alert-- for you do not know when the master of the house is coming, whether in the evening, at midnight, or when the rooster crows, or in the morning--