Contabulátio, onis, f. g. Verbale. Cælar. A floore bourded, or the bourding of a sioore.
Lewis and Short: Latin dictionary
contăbŭlātĭo, ōnis, f. [contabulo], 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.— II.Transf., of garments, folds, tucks, App. M. 11, p. 258, 26.