Lewis & Short

explēmentum, i, n. [expleo], that which fills up.

  1. I. Lit., of food, a filling, stuffing: inanimentis explementum quaerito, Plaut. Stich. 1, 3, 19: cacumina arborum explementum esse ventris, Sen. Ep. 110, 12.
  2. * II. Trop., of speech, a complement, supplement: quod sequitur … explementum esse, Sen. Suas. 2, 20.