'Linearly' definitions:

Definition of 'linearly'

(from WordNet)
adverb
In a linear manner; "linearly polarized radiation"; "it grew linearly" [ant: geometrically]

Definition of 'Linearly'

From: GCIDE
  • Linearly \Lin"e*ar*ly\, adv. In a linear manner; with lines. [1913 Webster]