Here is a link to the mentions of "Adventus" in the Latin Vulgate Bible-you can click to translate to the Douay-Rheims English version.
Here is some more info from a website highlighting two of my favorite “non doubting” Thomases, Thomas Aquinas and Thomas More:
http://www.aquinasandmore.com/catholic-articles/The-History-and-Meaning-of-Advent/article/173