Source : Webster's Revised Unabridged Dictionary (1913)

Vivid \Viv"id\, a. [L. vividus, from vivere to life; akin to
   vivus living. See {Quick}, a., and cf. {Revive}, {Viand},
   {Victuals}, {Vital}.]
   1. True to the life; exhibiting the appearance of life or
      freshness; animated; spirited; bright; strong; intense;
      as, vivid colors.

            In dazzling streaks the vivid lightnings play.
                                                  --Cowper.

            Arts which present, with all the vivid charms of
            painting, the human face and human form divine.
                                                  --Bp. Hobart.

   2. Forming brilliant images, or painting in lively colors;
      lively; sprightly; as, a vivid imagination.

            Body is a fit workhouse for sprightly, vivid
            faculties to exercise . . . themselves in. --South.

   Syn: Clear; lucid; bright; strong; striking; lively; quick;
        sprightly; active. -- {Viv"id*ly}, adv. --
        {Viv"id*ness}, n.

Source : WordNet®

vividness
     n 1: interest and variety and intensity; "the Puritan Period was
          lacking in color" [syn: {color}, {colour}]
     2: chromatic purity: freedom from dilution with white and hence
        vividness of hue [syn: {saturation}, {chroma}, {intensity}]