com-mūnĭo, īvi or ii, ītum, 4, v. a., to fortify on all sides or strongly, to secure, barricade, intrench (class.).
I Prop.: castella, Caes. B. G. 1, 8; Nep. Alcib. 7, 4: castra, Caes. B. G. 5, 49; Liv. 2, 32, 4; 21, 32, 11; 42, 58, 1: loca castellis idonea, Nep. Milt. 2, 1: hibernacula, Liv. 22, 32, 1: praesidium, id. 2, 49, 8: tumulum, Caes. B. C. 1, 43.—Transf.: os arteriae, Gell. 17, 11, 5.—
II Trop., to make sure , to strengthen : auctoritatem aulae, Cic. Fam. 15, 4, 6 (cf. aula, II. A.): causam testimoniis, id. Rosc. Com. 15, 43: jus, id. Caecin. 26, 74.