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Webster 1913 Edition

adv.

In a linear manner; with lines.

linearly ‎(comparative more linearly, superlative most linearly)

In a linear manner.
In a straight line.
Sequentially in time; chronologically.
In the manner of a linear function.
The effect related linearly to the amount of causative agent added.
(dance) Forward or backward, as opposed to laterally or diagonally.

in a linear manner

in a straight line