Source : Webster's Revised Unabridged Dictionary (1913)

Leze majesty \Leze` maj"es*ty\ (l[=e]z` m[a^]j"[e^]s*t[y^]). [F.
   lese-majest['e], fr. L. laesus, fem. laesa, injured (see
   {Lesion}) + majestas majesty; that is, crimen laesae
   majestatis.] [Written also {lese majesty}.] (Law)
   Any crime committed against the sovereign power.

Source : WordNet®

lese majesty
     n : a crime that undermines the offender's government [syn: {treason},
          {high treason}]