[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 underlineation.