Lewis Short
(adjective) : līnĕāris, e (or līnĭāris), id.
* Of or belonging to lines, consisting of lines, linear: pictura,the art of drawing with lines, without colors,Plin. 35, 3, 5, § 16: ratio,the science of lines, geometry,Quint. 1, 10, 36: probatio,a proving by means of lines, a mathematical demonstration,id. 1, 10, 49.—Adv.: līnĕārĭter, by lines, Boëth. Inst. Music. 3, 9 init.
Charlton T. Lewis, Charles Short, A Latin Dictionary