Lewis & Short

praelībātĭo, ōnis, f. [praelibo], a tasting or taking away beforehand (post-class.).

  1. I. Lit., an offering of the first-fruits: praemetium, quod praelibationis causā ante praemetitur, Paul. ex Fest. s. v. praemetium, p. 235 Müll.: labiorum, a slight touch of the lips, a gentle kiss, Ambros. Isaac et Anim. 3, 8 fin.
  2. II. Trop., a lessening, diminution, Tert. Anim. 58.