oquic.

oquic. mientras que, o entretanto.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 77v. col. 2. Thanks to Joe Campbell for providing the transcription.

OQUĪC while, as long as / mientras que, o entretanto (M) The sense of this appears to be the combined sense of OC and ĪC, but the second vowel is attested marked long only a single time in B. C does not mark it long in any of abundant attestations. OC, ĪC.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 180.

oquīc = while, as long as
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), 508.