(astronomy) A comet, cataloged as “C/1999 S4”, discovered on September 27, 1999, by the Lincoln Near-Earth Asteroid Research program in New Mexico. (See [1]) Sometimes spelled LINEAR.

(radio slang) Ellipsis of linear amplifier..

Having the form of a line; straight or roughly straight; following a direct course.

Of or relating to lines.

Made, or designed to be used, in a step-by-step, sequential manner.

(botany, of leaves) Long and narrow, with nearly parallel sides.

Having a degree less than one, or involving only linear polynomials.

A linear function or map is one that preserves vector addition and scalar multiplication.

(as opposed to area or volume) (physics) A type of length measurement involving only one spatial dimension .