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]

Moby Thesaurus II by Grady Ward, 1.0:

87 Moby Thesaurus words for "sunshine":
   Saturnia regna, Saturnian age, age of Aquarius, beatification,
   beatitude, bewitchment, blessedness, bliss, blissfulness,
   broad day, cheer, cheerfulness, clarion, clear, cloud nine,
   cloudless, dawn, day, day glow, daylight, dayshine, daytide,
   daytime, delectation, delight, dusk, ecstasy, ecstatics, elation,
   enchantment, era of prosperity, exaltation, exhilaration,
   exuberance, fair weather, felicity, fine, full sun, gaiety,
   gladness, glee, golden age, golden era, golden time, good times,
   green flash, halcyon days, happiness, heaven, heyday, high spirits,
   intoxication, joy, joyance, joyfulness, light of day, midday sun,
   millennium, noonlight, noontide light, overhappiness,
   overjoyfulness, palmy days, paradise, piping times, pleasant,
   prosperity, rainless, rapture, ravishment, ray of sunshine,
   reign of Saturn, rosy era, seventh heaven, shine, sun, sun spark,
   sunbeam, sunbreak, sunburst, sunlight, sunny, sunshiny, transport,
   twilight, unalloyed happiness, utopia