omextin.

Headword: 
omextin.
Principal English Translation: 

both, the two

Orthographic Variants: 
omexti, omestin, momestin
IPAspelling: 
oːmeʃtin
Lockhart’s Nahuatl as Written: 

both. always half possessed, with a pl. possessive prefix. -xtin has the same sense with any number, the total. īmēixtin, all three, etc. 228
James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 228.

Attestations from sources in English: 

ymomestin = both (also as yn momestin) attested in a seventeenth-century Guatemalan music manuscript)
Fernando Horcasitas y Alfred Lemmon, "El Tratado de Santa Eulalia: un manuscrito musical náhuatl," Tlalocan 12 (1997), 94–95.

themes: