Principal English Translation:
pasture, upland, grassy field; agricultural land that is dependent upon rainfall
Attestations from sources in English:
combines xiuh (grass) & milli (field) -- -uh will assimilate to certain consonants (such as m & p) in this kind of combining form
Robert Haskett and Stephanie Wood's notes from Nahuatl sessions with James Lockhart and subsequent research.
gaspar tlallotlac tequitlato quauhtamalli auh amo ypā tlatohua tlayoltemalli ximilli = Gaspar Tlayllotlac, tequitlato of Quauhtamalla [Guatemala]. He did not take care of the tlayoltemalli and ximilli there. (Tepoztlan, n.d.)
Robert Haskett and Stephanie Wood, translation of an unpublished manuscript, Archivo General de la Nación, México, Hospital de Jesús, Leg. 210, exp. 71.]
Attestations from sources in Spanish:
xinmilli = la tierra temporal (Tetepango, Hidalgo, 1586)
Vidas y bienes olvidados: Testamentos indígenas novohispanos, vol. 2, Testamentos en náhuatl y castellano del siglo XVI, eds., Teresa Rojas Rabiela, Elsa Leticia Rea López, Constantino Medina Lima (Mexico: Consejo Nacional de Ciencias Tecnología, 1999), 264–265.
in ximilpanehua = de temporal
[o sea, una milpa que recibe el agua por medio de las lluvias]
Pedro de Arenas, Vocabulario Manual de las Lenguas Castellana, y Mexicana (Mexico: Henrico Martínez, 1611), 9.