Webster’s Revised Unabridged Dictionary · 1913
Transfiguration
Trans·fig′u·ra′tion (·rā′shŭn), n. [L. transfiguratio: cf. transfiguration.] 1. A change of form or appearance; especially, the supernatural change in the personal appearance of our Savior on the mount.
2. (Eccl.) A feast held by some branches of the Christian church on the 6th of August, in commemoration of the miraculous change above mentioned.