Source : Webster's Revised Unabridged Dictionary (1913)

Emphasize \Em"pha*size\, v. t. [imp. & p. p. {Emphasized}; p.
   pr. & vb. n. {Emphasizing}.]
   To utter or pronounce with a particular stress of voice; to
   make emphatic; as, to emphasize a word or a phrase.

Source : WordNet®

emphasizing
     n : the act of giving special importance or significance to
         something [syn: {accenting}, {accentuation}]