Principal English Translation: 

within, inside a person (compound postposition) (see Karttunen)

Orthographic Variants: 
Frances Karttunen: 

-IHTECCOPA compound postposition to within / en sí mismo, dentro de uno (T) [(3)Tp.130]. N intervenes between this and –TZINCO in an attestation in T, but the final element here should definitely be –PA, not –PAN. See –IHTEC, -C(O), -PA.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 99.