en.

(a loanword from Spanish)

Headword: 
en.
Principal English Translation: 

in, on
(a loanword from Spanish)

Attestations from sources in English: 

En la noble çiudad de xuchco a xxiiii dias del mes de julio (Xochimilco, 1572)
Frances Karttunen and James Lockhart, Nahuatl in the Middle Years: Language Contact Phenomena in Texts of the Colonial Period, Linguistics 85 (Los Angeles, University of California Publications, 1976), Doc. 2.