Principal English Translation: 

when or where one was there to hear something, in one's lifetime or within one's reach

James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 235.

Orthographic Variants: 
Lockhart’s Nahuatl as Written: 

locative noun. tla-, caqui, -yān. 235