1. (adj.)voluntary done, made, brought about, or undertaken of one's own accord or by free choice: a voluntary contribution.
2. voluntary of, pertaining to, or acting in accord with the will.
3. voluntary of, pertaining to, or depending on voluntary action: voluntary hospitals.
4. voluntary done by or composed of volunteers.
5. voluntary Law.
6. voluntary acting or done without compulsion or obligation.
7. voluntary done by intention, and not by accident: voluntary manslaughter.
8. voluntary made without valuable consideration: a voluntary settlement.
9. voluntary subject to or controlled by the will.
10. voluntary having the power of willing or choosing: a voluntary agent.
11. voluntary proceeding from a natural impulse; spontaneous.
12. (n.)voluntary someone or something voluntary.
13. voluntary a piece of music performed as a prelude to a larger work, esp. an organ piece performed before, during, or after a church service.
Etymology: (1825–35)
Definition of 'voluntary'
Princeton's WordNet
1. (noun)volunteer, military volunteer, voluntary (military) a person who freely enlists for service
2. (adj)voluntary composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance
3. (adj)voluntary 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"
4. (adj)voluntary controlled by individual volition "voluntary motions"; "voluntary muscles"
2. voluntary (of work) done without payment voluntary work; He voluntarily answered the officer's questions.
Definition of 'voluntary'
Webster Dictionary
1. (noun)voluntary one who engages in any affair of his own free will; a volunteer
2. (noun)voluntary a piece played by a musician, often extemporarily, according to his fancy; specifically, an organ solo played before, during, or after divine service
3. (noun)voluntary one who advocates voluntaryism
4. (verb)voluntary proceeding from the will; produced in or by an act of choice
5. (verb)voluntary unconstrained by the interference of another; unimpelled by the influence of another; not prompted or persuaded by another; done of his or its own accord; spontaneous; acting of one's self, or of itself; free
6. (verb)voluntary done by design or intention; intentional; purposed; intended; not accidental; as, if a man kills another by lopping a tree, it is not voluntarymanslaughter
7. (verb)voluntary of or pertaining to the will; subject to, or regulated by, the will; as, the voluntary motions of an animal, such as the movements of the leg or arm (in distinction from involuntary motions, such as the movements of the heart); the voluntarymuscle fibers, which are the agents in voluntarymotion
8. (verb)voluntary endowed with the power of willing; as, man is a voluntaryagent
9. (verb)voluntary free; without compulsion; according to the will, consent, or agreement, of a party; without consideration; gratuitous; without valuableconsideration
10. (verb)voluntary of or pertaining to voluntaryism; as, a voluntary church, in distinction from an established or statechurch
Sense: done, given etc by choice, not by accident or because of being forced (often without pay) Their action was completely voluntary; – nobody asked them to do that.
Definitions of voluntary 
Afrikaans: vrywillig
Arabic: طَوْعي
Bulgarian: доброволен
Brazilian: voluntário
Czech: dobrovolný
German: freiwillig
Danish: frivillig
Greek: εθελοντικός, εκούσιος, οι
Spanish: voluntario
Estonian: vabatahtlik
Farsi: اختیاری
Finnish: vapaaehtoinen
French: volontaire
Hebrew: מֵרַצוֹן
Hindi: अपनी ही इच्छा से किया हुआ
Croatian: dragovoljan
Hungarian: önkéntes
Indonesian: dengan sukarela
Icelandic: sjálfviljugur
Italian: volontario
Japanese: 自発的な
Korean: 자진하여 하는
Lithuanian: savanoriškas
Latvian: brīvprātīgs
Malay: sukarela
Dutch: vrijwillig
Norwegian: frivillig; forsettlig, ov
Polish: ochotniczy, spontaniczny
Portuguese: voluntário
Romanian: benevol
Russian: добровольный
Slovak: dobrovoľný
Slovenian: premišljen
Serbian: volonterski
Swedish: frivillig
Thai: โดยสมัครใจ
Turkish: gönüllü, istemli
Taiwanese: 自願的
Ukrainian: добровільний; добровольчи
Urdu: بالارادہ
Vietnamese: tự nguyện
Chinese: 自愿的
