cepanoa.

Headword: 
cepanoa.
Principal English Translation: 

to join; or, to make oneself one with, through friendship or love

IPAspelling: 
seːpɑnoɑ
Alonso de Molina: 

cepanoa tito. (pret. otitocepanoque.) vnirse, o hazerse vna misma cosa, por via de amistad y bien querencia.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 18r. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

cepanoa (verb) = to unite, to join together Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 152.

themes: 
Emotions
Friendship, Affection
Sexuality, Fertility