Meaning of relative pitch

rel'ative pitch'

Pronunciation: [key]
— Music. Music.
  1. the pitch of a tone as determined by its relationship to other tones in a scale.
  2. the ability to identify or sing a tone by mentally determining the distance of its pitch from that of a tone already sounded. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.