Linear (album) definition

(1) Of a circuit or device having an output that is proportional to the input

"Analogue device"

"Linear amplifier"

(2) Of or in or along or relating to a line; involving a single dimension

"A linear measurement"

(3) Designating or involving an equation whose terms are of the first degree

(4) Measured lengthwise

"Cost of lumber per running foot"

(5) Of a leaf shape; long and narrow