LATIN DICTIONARYLexicon Latīnum
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“convoy” in Latin

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

convoy
aliquem praesidii causa comitari: praesidio esse alicui or alicui rei (e.g., impedimentis): aliquem comitari (general term for accompanying).
convoy s.
As protecting force, presidium (general term): milites praesidiarii: (of ships) *naves praesidiariae. To grant anyboby a convoy, praesidium alicui dare: a strong convoy, firmo praesidio aliquem munire: to grant anybody a convoy to any place, praesidium dare, ut aliquis tuto perveniat aliquem locum (Nep. Epam., 4, 4); efficere, ut tuto aliquis aliquem locum perveniat (Id., Timol., 2, 2). To serve as a convoy, praesidio esse (alicui, navibus, etc.).
OBS. Sometimes “convoy” includes both the protecting and protected fleets (Webst.), *naves mercatoriae (firmo) praesidio or praesidiaria classe munitae; or commeatus (body of persons sailing, travelling together; e.g., commeatus nostri Pontico mari ac Trapezunte oppido adventantes, Tac.). To cut off our convoys, commeatus nostros intercipere (if they were bringing in supplies).

Quick answer

What is the Latin word for convoy?
The usual Latin words for “convoy” are impedīmentum, efficiō, nāvis. 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.