Artificial intelligent assistant

underlineation

underlineˈation
  [f. prec., after interlineation.]
  The action or result of underlining.

a 1814 Masquerade i. i. in New Brit. Theatre I. 223 It is like Italics in print, or underlineation in writing, and always means more than meets the ear. 1864 Realm 17 Feb. 2 This extract Mr. Cobden copied, with the due amount of under⁓lineation.

Oxford English Dictionary

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