Lewis & Short

dēlībātĭo, ōnis, f. [delibo],

  1. I. a taking away from, diminishing (post-class.): hereditatis, Dig. 30, 113; Tert. adv. Marc. 1, 22.
  2. II. The first fruit, sample, representative portion: quod si delibatio sancta est, et massa, Vulg. Rom. 11, 16.