[adj] (electronics) of a circuit or device having an output that is proportional to the input; "analogue device"; "linear amplifier"
[adj] of or in or along or relating to a line; involving a single dimension; "a linear foot"
[adj] (mathematics) directly proportional
[adj] measured lengthwise; "cost of lumber per running foot"
[adj] of a leaf shape; long and narrow
additive, analog, analogue, bilinear, collinear, elongate, lengthways, lengthwise, lineal, linelike, one-dimensional, rectilineal, rectilinear, running(a), simple, unsubdivided