Meaning of systematic phoneme

sys'temat'ic pho'neme

Pronunciation: [key]
— Ling. Ling.
  1. a phonological unit in generative phonology representing an underlying form that takes into account the relationship between phonological patterns and morphological variation, as the unit underlying the second vowel in both derive and derivative. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.