What is the Latin word for at length?

The usual Latin words for “at length” are tandem, dēmum, lātus; also fundō, cōpiōsus. The right choice depends on the sense; see the distinctions below.

English → Latin

“at length” in Latin

tandemat length, at last, finally, eventually; used also as an adverbial intensifier of interrogatives to a somewhat greater d dēmumfinally, at last, eventually; only, exclusively lātusborne, carried, having been carried; suffered, endured, having been suffered; reported, having been reported fundōto pour out, shed; to melt, cast, found, make by smelting; to overthrow, overcome, rout, vanquish an enemy, rout, scatte cōpiōsuscopious, plentiful, abundant; prolific; eloquent

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

at length

At last, tandem (in speaking of things which have been long expected or wished); demum (of things which are late or behind their time): then at length, tum demum: now at length, nunc demum: ☞ denique, postremo mean “lastly.”

Copiously, diffusely, lata; fuse; (The words are found in this connection and order.) fuse lateque; copiose.

Quick answer

What is the Latin word for at length?: The usual Latin words for “at length” are tandem, dēmum, lātus; also fundō, cōpiōsus. 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.