alternation of generations: Meaning and Definition of

alterna'tion of genera'tions

Pronunciation: [key]
— Biol. Biol.
  1. the alternation in an organism's life cycle of dissimilar reproductive forms, esp. the alternation of sexual with asexual reproduction.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.