Principal English Translation: 

(an indicator of indefiniteness)

Horacio Carochi / English: 

-â = (indicator of indefiniteness)
Horacio Carochi, S.J., Grammar of the Mexican language with an explanation of its adverbs (1645), translated and edited with commentary by James Lockhart, UCLA Latin American Studies Volume 89 (Stanford: Stanford University Press, UCLA Latin American Center Publications, 2001), 67 n5, 338 n2, 376 n1, 428 n1.