sunset (n.)

  1. the time in the evening at which the sun begins to fall below the horizon

    [ Syn: sundown ]

  2. atmospheric phenomena accompanying the daily disappearance of the sun

  3. the daily event of the sun sinking below the horizon

    sunset (adj.)

  1. of a declining industry or technology; sunset industries'

  2. providing for termination; a program with a sunset provision'

The dictionary is based on the WordNet Electronic Lexical Database.
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