Source : Webster's Revised Unabridged Dictionary (1913)

Soi-disant \Soi`-di*sant"\, a. [F.; soi one's self + disant, p.
   pr. of dire to say.]
   Self-named; self-styled.

Soi-disant \Soi`-di`sant"\, a. [F.]
   Calling himself; self-styled; pretended; would-be.

Source : WordNet®

soi-disant
     adj : as claimed by and for yourself often without justification;
           "the self-styled `doctor' has no degree of any kind"
           [syn: {self-styled}]