Meaning of LINEAR in English

lin ‧ e ‧ ar /ˈlɪniə $ -ər/ BrE AmE adjective

1 . consisting of lines, or in the form of a straight line:

a linear diagram

2 . [only before noun] relating to length:

linear measurements

3 . involving a series of connected events, ideas etc, that move or progress from one stage to the next:

linear thinking

—linearly adverb

—linearity /ˌlɪniˈærəti, ˌlɪniˈærɪti/ noun [uncountable]

⇨ ↑ lateral thinking

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.