#1 linear a. [additive] designating or involving an equation whose terms are of the first degree. wn
#2 linear a. [one-dimensional] of or in or along or relating to a line; involving a single dimension; "a linear measurement". wn
#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 linear s. [elongate] (of a leaf shape) long and narrow. wn
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