Lewis & Short

contăbŭlātĭo, ōnis, f. [contabulo],

  1. I. a joining of boards together, a flooring, planking; a floor or story, a covering of boards (very rare), Caes. B. C. 2, 9 (four times); Vitr. 10, 15, 3: proscenii, App. Flor. 4, 18.
  2. II. Transf., of garments, folds, tucks, App. M. 11, p. 258, 26.