/ Dictionary / Index N normal series: Meaning and Definition of Find definitions for: nor'mal se'ries Pronunciation: [key] — Math. Math. a collection of subgroups of a given group so arranged that the first subgroup is the identity, the last subgroup is the group itself, and each subgroup is a normal subgroup of the succeeding subgroup. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. normal school normal Zeeman effect Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language