Yours, Etc.: Origins and Uses of 8 Sign-Offs
c.1400, "make impure by admixture," from Medieval Latin sophisticatus, past participle of sophisticare (see sophistication). From c.1600 as "corrupt, delude by sophistry;" from 1796 as "deprive of simplicity." Related: Sophisticated; sophisticating. As a noun meaning "sophisticated person" from 1921.