LATIN DICTIONARYLexicon Latīnum
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“investigation” in Latin

The English word investigation itself goes back to Latin vestīgō, through investigatio.

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

investigation
indagatio: investigatio (the tracing out): spectatio: cognitio (the examination, trial, etc.). The investigation of truth, investigatio veri: veri inquisitio atque investigatio (where inquisitio means the examination, in each case, of what is true; investigatio, the pursuing the often obscure traces of truth, Cic., Off., 1, 4, 13): cognitio veri (the sifting of the truth). To give one’s self entirely up to the investigation of anything, totum se in aliqua re exquirenda collocare.

Quick answer

What is the Latin word for investigation?
The usual Latin words for “investigation” are indāgātiō, investīgātiō, spectātiō; also cognitiō. 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.