LATIN DICTIONARYLexicon Latīnum
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“infantry” in Latin

The English word infantry itself goes back to Latin for, through īnfāns.

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

infantry
peditatus: pedites: copiae pedestres: exercitus pedester. The infantry, as opposed to “cavalry,” are mostly denoted by the historians simply by exercitus, cohortes, milites; also by viri, homines; hence frequently milites equitesque, exercitus equitatusque, exercitus cum equitatu, equites virique, homines equitesque (☞ Herzog, and Maeb., Caes., B.G., 5, 10; 7, 61). Light infantry, pedites levis armaturae: heavy-armed infantry, pedites gravis armaturae: gravius peditum agmen (on their march).

Quick answer

What is the Latin word for infantry?
The usual Latin words for “infantry” are peditātus, pedes, exercitus; also cohors, mīles, vir. 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.