Viaticum \Vi*at"i*cum\, n. [L., from viaticus, a. See {Viatic}.] 1. (Rom. Antiq.) An allowance for traveling expenses made to those who were sent into the provinces to exercise any office or perform any service. [1913 Webster] 2. Provisions for a journey. --Davies (Wit's Pilgr.). [1913 Webster] 3. (R. C. Ch.) The communion, or eucharist, when given to persons in danger of death. [1913 Webster]