Lewis & Short

bĭvĭus, a, um, adj. [bis-via], having two ways or passages (rare; not in Cic.): fauces, Verg. A. 11, 516.
So, calles, Val. Fl. 5, 395: di, deae, worshipped at cross-roads, Inscr. Orell. 2105.
Hence, substt.

  1. A. bĭvĭi (sc. di), Inscr. Orell. 389; 2104.
  2. B. bĭvĭum, i, n., a place with two ways, or where two ways meet.
    1. 1. Lit.: in bivio portae, Verg. A. 9, 238: ad bivia consistere, Liv. 38, 45, 8; Plin. 6, 28, 32, § 144; Vulg. Marc. 11, 4.
    2. 2. Trop.: bivium nobis ad culturam dedit natura, experientiam et imitationem, a twofold means or method, Varr. R. R. 1, 18, 7.
      Of a twofold love, Ov. R. Am. 486.