LATIN DICTIONARYLexicon Latīnum
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“definitely” in Latin

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

definitely
certo or certe [SYN. in CERTAINLY]: definite (with a statement of all the peculiarities, etc., opposed to generatim): diserte (in express terms; ☞ not disertis verbis): ex destinato: destinato (post-Augustan, Suet.; with deliberate intention).

Quick answer

What is the Latin word for definitely?
The usual Latin words for “definitely” are certus, dēfīniō, disertus; also dēstinō. 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.