metagenesis noun. 
[mɛtǝ'dʒɛnɪsɪs] L19.[from META- + -GENESIS.]Biology. Alternation between sexual and asexual reproduction; alternation of generations.
 ■   metage'netic adjective of, pertaining to, characterized by, or involving metagenesis 
M19. ■   metage'netically adverb by metagenesis 
M19.  [TahlilGaran] English Dictionary ▲