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“while, whilst” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

while, whilst
conjunction, dum (during the time that; as; denoting that one event is contemporary with another; generally joined with the present indicative, even when events of the past time are spoken of, but we sometimes find the perfect: dum in the sense of quamdiu, “as long as, when referring to the past time, is regularly joined with the imperfect; Zumpt, § 506, 507; the answering clause often begins with subito, repente: to mark a sudden, unexpected event, integer jam, interea jam, in Liv., interim): donec (not used = “as long as” before Augustan poets and Liv.): cum (at the time when, denoting simultaneousness, with the perfect or imperfect indicative, the perfect being used in historical narratives, the imperfect in descriptions: the simultaneousness is marked more emphatically by adding interea or interim; Zumpt, § 580). As used to point out the coexistence of two states, etc., that should not coexist, cum interea, or cum only; e.g., bellum subito exarsit, cum Ligarius, domum spectans, nullo se negotio implicari passus est (“while Ligarius all the while,” etc.).

Quick answer

What is the Latin word for while, whilst?
The usual Latin words for “while, whilst” are dum, dōnec, repēns. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.