§552. Dum, Dōnec, and Quoad
As an adverb meaning for a time, awhile, dum is found in old Latin, chiefly as an enclitic (cf. vixdum, nōndum). Its use as a conjunction comes either through correlation (cf. cum ... tum, sī ... sīc) or through substitution for a conjunction, as in the English the moment I saw it, I understood. Quoad is a compound of the relative quō, up to which point, with ad. The origin and early history of dōnec are unknown.
J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.