Definitions from Wiktionary ( )

▸ adjective:  Having the form of a line; straight or roughly straight; following a direct course.
▸ adjective:  Of or relating to lines.
▸ adjective:  Made, or designed to be used, in a step-by-step, sequential manner.
▸ adjective:  (botany, of leaves) Long and narrow, with nearly parallel sides.
▸ adjective:  (mathematics) (of polynomials or polynomial equations)
▸ adjective:  (of a polynomial) Having degree one; that is, being of the form a_1x_1+a_2x_2+⋯+a_nx_n+b, where each x_i is a variable. See also Linear polynomials on Wikipedia.Wikipedia
▸ adjective:  (of a polynomial equation) Involving only linear polynomials. See also Linear equation on Wikipedia.Wikipedia
▸ adjective:  (mathematics) (of functions or maps)
▸ adjective:  (of a function between vector spaces) An additive, homogeneous mapping; that is, a function f:V→W is linear if it distributes over vector addition (f( mathbf v+ mathbf w)=f( mathbf v)+f( mathbf w)) and respects scalar multiplication (f(c mathbf v)=cf( mathbf v)). If V and W are vector spaces over a field K, f may also be called a K-linear map. See also linear map on Wikipedia.Wikipedia
▸ adjective:  (of a function over a module) A module homomorphism; that is, a group homomorphism that commutes with scalar multiplication. See also Module homomorphism on Wikipedia.Wikipedia
▸ adjective:  (physics) A type of length measurement involving only one spatial dimension (as opposed to area or volume).
▸ noun:  (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 https://web.archive.org/web/20051220100856/http://www.windows.ucar.edu/tour/link=/comets/linear.html) Sometimes spelled LINEAR.
▸ noun:  (radio slang) Ellipsis of linear amplifier. [An electronic circuit whose output is proportional to its input, but capable of delivering more power into a load.]
▸ noun:  (astronomy) Initialism of Lincoln Near-Earth Asteroid Research program.

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