say it: VAH-luhn-teh-ree
voluntary is a noun and adjective meaning "(military) a person who freely enlists for service". It carries 4 recorded senses.
(military) a person who freely enlists for service
military
of your own free will or design; done by choice; not forced or compelled
“man is a voluntary agent”
“participation was voluntary”
“voluntary manslaughter”
“voluntary generosity in times of disaster”
“voluntary social workers”
“a voluntary confession”
controlled by individual volition
“voluntary motions”
“voluntary muscles”
physiology
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for voluntary come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.