The difference between Linear and Spatial

When used as adjectives, linear means having the form of a line, whereas spatial means pertaining to (the dimension of) space.

check bellow for the other definitions of Linear and Spatial

Linear as an adjective:

Having the form of a line; straight.
Linear as an adjective:

Of or relating to lines.
Linear as an adjective:

Made in a step-by-step, logical manner.
Linear as an adjective (botany, of leaves):

Long and narrow, with nearly parallel sides.
Linear as an adjective (mathematics):

Of or relating to a class of polynomial of the form y = ax + b .
Linear as an adjective (physics):

A type of length measurement involving only one spatial dimension .

Examples:

"a [[linear meter]]"