资料来源 : Webster's Revised Unabridged Dictionary (1913)

Jactancy \Jac"tan*cy\, n. [L. jactantia, fr. jactans, p. pr. of
   jactare to throw, boast, freq. fr. jacere to throw; cf. F.
   jactance.]
   A boasting; a bragging. [Obs.]