voi·là (vwä-lä') interj. Used to call attention to or express satisfaction with a thing shown or accomplished: Mix the ingredients, chill, and—voilà!—a light, tasty dessert.
[French : voi, second person sing. imperative of voir, to see (from Old French; see voyeur) + là, there (from Old French la, lai, probably from Latin illāc, by that way : illā, ablative sing. feminine of ille, that; see al-1 in Indo-European roots + -ce, deictic particle).]