Source : Webster's Revised Unabridged Dictionary (1913)

Jenneting \Jen"net*ing\, n. [Prob. fr. a dim. of Jean John, so
   named as becoming ripe about St. John's day, June 24. F. Jean
   is fr. L. Johannes. See {Zany}.]
   A variety of early apple. See {Juneating}. [Written also
   {geniting}.]