achica.

Headword: 
achica.
Principal English Translation: 

often, frequently (see Molina); a little bit, a little bit of time; shortly; a little bit more

IPAspelling: 
ɑtʃikɑ
Alonso de Molina: 

achica. amenudo, o frequentemente. aduerbio.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 2r. col. 1. Thanks to Joe Campbell for providing the transcription.

Andrés de Olmos: 

Achica, achitzinca, achitonca, un poco de tiempo.
Andrés de Olmos, Arte para aprender la lengua Mexicana, ed. Rémi Siméon, facsimile edition ed. Miguel León-Portilla (Guadalajara: Edmundo Aviña Levy, 1972), 189.

Attestations from sources in English: 

achica antica = to be a bit distant from something (temporally)
Rebecca Horn's notes from Nahuatl classes with James Lockhart at UCLA. Harvested by SW.

themes: 
Time, Calendar, Frequency