LATIN DICTIONARYLexicon Latīnum
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“volunteer” in Latin

The English word volunteer itself goes back to Latin voluntās, through voluntārius.

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

volunteer
voluntarius miles: voluntarius; plur., milites voluntarii: voluntariam extra ordinem professi militiam: qui voluntariam sequuntur militiam (who have offered themselves for military service): evocati (veterans, who when called upon serve again). To enroll volunteers, voluntarios milites conscribere: to collect a corps of volunteers, manum voluntariorum cogere: to serve as a volunteer, voluntariam sequi militiam (under the standard of any one): castra alicujus sequi.

Quick answer

What is the Latin word for volunteer?
The usual Latin words for “volunteer” are voluntārius, ēvocō, veterō. 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.