pitli.

Headword: 
pitli.
Principal English Translation: 

older sister; cousin

IPAspelling: 
pihtɬi
Alonso de Molina: 

pitli. hermana mayor, o dama, o criada que acompaña a su señora.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 82v. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

PIH-TLI older sister (from the point of view of a woman), lady's maid / hermana mayor o dama o criada que acompaña a su señora (M) [(1)Bf.11r,(2)Cf.83v]. C comments that the honorific form -PIHTICĀTZIN is more affectionate than simple -PIHTZIN.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 194.

Attestations from sources in English: 

nopi = my older sister
Robert Haskett and Stephanie Wood's notes from Nahuatl sessions with James Lockhart and subsequent research.

Attestations from sources in Spanish: 

nupipi = pitli
no:man = hermano mayor.
Naja nikatajtanilia nomedio no:man. = Yo pido dinero a mi hermano mayor. (Sonsonate, El Salvador, Nahuat or Pipil, s. XX)
Tirso Canales, Nahuat (San Salvador: Universidad de El Salvador, Editorial Universitaria, 1996), 23–24.

themes: 
Aging (People, Things)
Family, Kinship, Descent