Regular navigation
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In this phrase, the word "regular" may be used in contradistinction to "occasional," rather than to "unlawful," and refer to vessels that, alone or with others, constitute lines, and not merely to such as are regular in the sense of being properly documented under the laws of the country to which they belong.
The Steamer Smidt, 16 Op. Attys. Gen. 276.