Definitions of evening:

• noun:   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"

• noun:   the early part of night (from dinner until bedtime) spent in a special way

  Example: "An evening at the opera"

• noun:   a later concluding time period

  Example: "It was the evening of the Roman Empire"