sentences:  The Nahuatl word "Mēxihco" () was transliterated as "México" using Medieval Spanish orthography, in which the "x" represented the voiceless postalveolar fricative (, the equivalent of English "sh" in "shop"), making "México" pronounced as .At the time, Spanish "j" represented the voiced postalveolar fricative (, like the English "s" in "vision", or French "j" today).However, by the end of the fifteenth century "j" had evolved into a voiceless palato-alveolar sibilant as well, and thus both "x" and "j" represented the same sound ().