What is the meaning of Linear?

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.

Long and narrow, with nearly parallel sides.

(of polynomials or polynomial equations)

1. Having degree one; that is, being of the form ${\displaystyle a_{1}x_{1}+a_{2}x_{2}+\cdots +a_{n}x_{n}+b}$, where each ${\displaystyle x_{i}}$ is a variable. See also Linear polynomials on Wikipedia.Wikipedia

   Having degree one; that is, being of the form ${\displaystyle a_{1}x_{1}+a_{2}x_{2}+\cdots +a_{n}x_{n}+b}$, where each ${\displaystyle x_{i}}$ is a variable. See also Linear polynomials on Wikipedia.Wikipedia

   Involving only linear polynomials. See also Linear equation on Wikipedia.Wikipedia

   (of functions or maps)

   1. An additive, homogeneous mapping; that is, a function ${\displaystyle f:V\to W}$ is linear if it distributes over vector addition (${\displaystyle f(\mathbf {v} +\mathbf {w} )=f(\mathbf {v} )+f(\mathbf {w} )}$) and respects scalar multiplication (${\displaystyle f(c\mathbf {v} )=cf(\mathbf {v} )}$). If ${\displaystyle V}$ and ${\displaystyle W}$ are vector spaces over a field ${\displaystyle K}$, ${\displaystyle f}$ may also be called a ${\displaystyle K}$-linear map. See also linear map on Wikipedia.Wikipedia

      An additive, homogeneous mapping; that is, a function ${\displaystyle f:V\to W}$ is linear if it distributes over vector addition (${\displaystyle f(\mathbf {v} +\mathbf {w} )=f(\mathbf {v} )+f(\mathbf {w} )}$) and respects scalar multiplication (${\displaystyle f(c\mathbf {v} )=cf(\mathbf {v} )}$). If ${\displaystyle V}$ and ${\displaystyle W}$ are vector spaces over a field ${\displaystyle K}$, ${\displaystyle f}$ may also be called a ${\displaystyle K}$-linear map. See also linear map on Wikipedia.Wikipedia

      A module homomorphism; that is, a group homomorphism that commutes with scalar multiplication. See also Module homomorphism on Wikipedia.Wikipedia

      A type of length measurement involving only one spatial dimension .

      Ellipsis of linear amplifier.

      linear

      alternative spelling of linièr (“linear”)

      linear (having the form of a straight line)

      linear (being a first-degree polynomial)

      linear (made in a step-by-step, logical manner)

      Alternative form of liniar

      linear

      to line

      to outline, mark out

      Source: wiktionary.org