two sorts or types (of animals or people, hence the animate plural ending)
Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 64.
something made or formed in two ways (see Molina)
two things, two parts, or pairs (see Molina)
two and a half pounds (see Molina)
800 (2 x 400) (see attestation from Cuernavaca)
a two-year-old colt (see Molina) (partly a Spanish loanword, caballo, horse)
every two place, in each two places (see Molina)
aborted; a fetus born before its time (see Molina); this may relate to movement (olin)