a royal seat in the war (see Molina); the -tzacuil- element in most compounds has something to do with protection, so perhaps this is a protected place during warfare? (SW)
Alonso de Molina:
neyaoquizcatzacuiliztli. assiento de real enla guerra. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 65v. col. 2. Thanks to Joe Campbell for providing the transcription.