LATIN DICTIONARYLexicon Latīnum
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“ensure” in Latin

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

ensure
Make safe, tutum reddere, facere or praestare: in tuto collocare aliquid (that had been in danger; e.g., famam): munire (provide with defence). To ensure against anything, tutum reddere adversus aliquid (e.g., adversus pericula, Cels.). To be ensured against anything, tutum or munitum esse ab aliqua re.
Make certain, confirmare aliquid or spem alicujus rei (confirmare spem successionis, Suet.): aliquid certum reddere.
Ensure a life, ship, house, etc. Vid: INSURE.

Quick answer

What is the Latin word for ensure?
The usual Latin words for “ensure” are praestō, mūniō, fāma; also tūtus. 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.