The Collaborative International Dictionary of English v.0.48:

Sunshine \Sun"shine`\, a.
   Sunshiny; bright. --Shak. "Sunshine hours." --Keble.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sunshine \Sun"shine`\, n.
   1. The light of the sun, or the place where it shines; the
      direct rays of the sun, the place where they fall, or the
      warmth and light which they give.
      [1913 Webster]

            But all sunshine, as when his beams at noon
            Culminate from the equator.           --Milton.
      [1913 Webster]

   2. Anything which has a warming and cheering influence like
      that of the rays of the sun; warmth; illumination;
      brightness.
      [1913 Webster]

            That man that sits within a monarch's heart,
            And ripens in the sunshine of his favor. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sunshine
    n 1: the rays of the sun; "the shingles were weathered by the
         sun and wind" [syn: sunlight, sunshine, sun]
    2: moderate weather; suitable for outdoor activities [syn: fair
       weather, sunshine, temperateness]
    3: the quality of being cheerful and dispelling gloom; "flowers
       added a note of cheerfulness to the drab room" [syn:
       cheerfulness, cheer, sunniness, sunshine] [ant:
       uncheerfulness]