Source : Webster's Revised Unabridged Dictionary (1913)

Philately \Phi*lat"e*ly\, n. [Philo- + Gr. ? exemption from tax;
   cf. frank to send free.]
   The collection of postage stamps of various issues.

Source : WordNet®

philately
     n : the collection and study of postage stamps [syn: {stamp
         collecting}, {stamp collection}]