intercălārĭus

I. of or for insertion, intercalary: mensis, Liv. 1, 19, 6; 37, 59, 2; Suet. Caes. 40; the same absol.: intercalarius, Cic. Verr. 2, 2, 52, § 130: annus, Plin. 2, 47, 48, § 130; 18, 25, 57, § 207.