LATIN DICTIONARYLexicon Latīnum
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“again” in Latin

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

again
rursus or rursum (again): iterum (a second time): denuo (= de novo, anew; relates to time, denoting repetition after an interval): ex integro (in Silver Age also integro; quite afresh; relates to the thing itself, which is to be brought back to a former state): vicissim (in turn; in the same manner that another has done it in before). With verbs it is often translated by the re (red) of a compound verb: to rise again, resurgere.
Hereafter, post, posthac, postea: that this may never happen again, id ne unquam posthac accidere possit: whom I was not likely ever to see again, quem non cram postea visurus.
In turn, contra, vicissim.
As used in a discourse to introduce an additional reason: praeterea: ad hoc, ad haec (besides this, never in good prose, super haec, super ista, adhuc): jam, autem (when the discourse is carried on in parts): accedit, accedit quod: huc accedit quod: addendum, eodem est, quod: adjice quod. (Observe, not porro.)
Again and again, etiam atque etiam: iterum et saepius: semel et saepius: semel atque iterum; semel iterumve (the last two less strong = several times, more than once).
As big again, altero tanto major (so longior, etc.), duplo major. As much again, alterum tantum: duplum.

Quick answer

What is the Latin word for again?
The usual Latin words for “again” are rūrsus, iter, dēnuō; also vicissim, post, posthāc. 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.