Source : Webster's Revised Unabridged Dictionary (1913)

Homograph \Hom"o*graph\, n. [Gr. "omo`grafos with the same
   letters; "omo`s the same + gra`fein to write.] (Philol.)
   One of two or more words identical in orthography, but having
   different derivations and meanings; as, fair, n., a market,
   and fair, a., beautiful.

Source : WordNet®

homograph
     n : two words are homographs if they are spelled the same way
         but differ in meaning (e.g. fair)