in icuac.

Headword: 
in icuac.
Principal English Translation: 

when; at that time, was when (see Molina)

Orthographic Variants: 
yn yquac, iniquac, in iquac, inicuac
Alonso de Molina: 

Iniquac. quando. affirmando algo. Aduerbio. o quando quieraque. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, f. 39r.

Andrés de Olmos: 

Yn iquac, quando
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: 

iniquac = when
Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 155.

themes: 
Time, Calendar, Frequency