the second generation, or the second birth (see Molina)
Orthographic Variants:
ic oppa tlacatiliztli
Alonso de Molina:
icoppa tlacatiliztli. segunda generacion, onatiuidad. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 33v. col. 2. Thanks to Joe Campbell for providing the transcription.