Lewis & Short

cardĭnālis, e, adj. [cardo].

  1. I. Of or pertaining to a door-hinge: scapi, Vitr. 4, 6, 4.
  2. II. Trop., that on which something turns, depends, i. e. principal, chief: venti, the principal or cardinal winds, Serv. ad Verg. A. 1, 131; Isid. Orig. 13, 11, 14; cf. virtutes, Hier ap. Macr. S. 1, 16-19; Ambros. ap. Luc. 5, § 49 al.
    Hence, in late Lat.: cardinalia Christi opera, Cypr.
    1. B. Esp.
      1. 1. As eccl. term; subst., a chief presbyter, as opp. to one who ministered in an Oratorium; and esp. of such forming the council of the Pope at Rome, which afterwards consisted only of bishops, cardinals, Anast. p. 95.
      2. 2. In gram.: numeri, the Cardinal Numbers (unus, duo, tres, etc., from which the Ordinals and Distributives are formed), Prisc. Pond. p. 1351 P.
        Hence, * cardĭ-nālĭter, adv., chiefly, principally: praesidere, especially, Firm. Math. 410.