linear
US /ˈlɪn.i.ɚ/
UK /ˈlɪn.i.ɚ/

1.
arranged in or extending along a straight or nearly straight line
:
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The road follows a linear path through the valley.
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The design features a series of linear patterns.
2.
progressing from one stage to the next in a single series of steps; sequential
:
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The story has a clear linear narrative.
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Learning a new language often involves a linear progression of skills.
3.
involving a single dimension; relating to length
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The problem can be solved using linear equations.
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The graph shows a linear relationship between two variables.