definition of
linear

[1] #1 linear a. [additive] designating or involving an equation whose terms are of the first degree. wn

[2] #2 linear a. [one-dimensional] of or in or along or relating to a line; involving a single dimension; "a linear measurement". wn

[3] #3 linear a. [analogue, analog] of a circuit or device having an output that is proportional to the input; "analogue device"; "linear amplifier". wn

[4] #4 linear s. [elongate] (of a leaf shape) long and narrow. wn