What is the Latin word for field-marshal?

The usual Latin words for “field-marshal” are praeficiō, praepōnō, imperō; also Velleius. The right choice depends on the sense; see the distinctions below.

English → Latin

“field-marshal” in Latin

praeficiōto place in command, put in charge praepōnōto place or set over as chief, commander, or superintendent; to place at the head of or entrust with the charge or comma imperōto command, give orders to, impose, demand; to rule, govern Velleiusof or pertaining to the gens Velleia.

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

field-marshal

praefectus or praepositus (general term): dux summus: imperator (as title of meritorious generals; Vid: Tac., Ann., 2, 74, 4; Velleius, 2, 125, 5). Of course, none of these will convey the exact meaning.

Quick answer

What is the Latin word for field-marshal?: The usual Latin words for “field-marshal” are praeficiō, praepōnō, imperō; also Velleius. 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.